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We could have watched a much better drama if only Hae-Jo didn't keep breaking up with Jae-mi. If he was going to leave all the time, why did he ruin the girl's wedding? They also had a somewhat toxic relationship. Their constant running away from Eo Heung got boring towards the end. Still, Woo Do Hwan we watched a visual feast because he was handsome... Was this review helpful to you?
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At times, depressing to watch, but very good
This story was amazing to watch play out. So many twists & turns, so many emotions. This was a melodrama with just enough comedy blended into the mix.Normally a ten episode series I find to be too short in the sense where things gets rushed to completion toward the end ... but this wasn't the case. It seemed to be just enough to give everything closure.
Beside Do Hwan, who plays a really great likeable character, the remaining protagonists all prove to add something special to the story as you get deep into this drama. Min Seok was definitely a comedy favorite part of this story. The bromance he shares with Hae Jo is touching, even after getting the hell kicked out of him throughout most of the show.
For me, the only negative I found was the ending. I was really hoping for some sort of miracle for our ailing main character. Wishing for a last minute cure or a hospital mix up with the terminal diagnosis. You really didn't want to see such the demise of such a great character ... but that wasn't meant to be. I guess it shouldn't be held as a negative against the series, after all, that's life, it's not always a happy ending.
Great show & great sound track with a very entertaining cast!!!
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My December 2025 recommendation
Watched this for my Recommendation Challenge from 𝑽𝒊𝒐𝒍𝒊𝒏𝑮𝒂𝒍. Yet another drama that I’ll never gonna touch if not because of Recommendation Challenge & ViolinGal.Let’s start our review…
Story about Hae Jo, a man cast out by his family because of his unknown parentage.
The story follows Hae Jo, a man who was cast out by his family because of his unclear parentage. Hae Jo was born with the help of a fertility clinic. But due to a terrible mistake, his father’s sperm was mixed with another donor’s. As a result, Hae Jo is not biologically his father’s son.
Now, as an adult, Hae Jo runs a “service-for-hire” agency—basically a jack-of-all-trades. He’ll do any job (as long as it’s not murder) for the right price.
One of his clients is a bride who wants to escape her wedding. She hires Hae Jo to kidnap her during the ceremony. He succeeds, but they get into an accident on the way and end up in the hospital. There, Hae Jo receives devastating news.
He suffers from multiple vascular malformations in his brain—14 enlarged, fragile blood vessels tangled like a ticking time bomb. They could rupture at any moment. The doctor gives him only three months to live. The condition is hereditary, which pushes Hae Jo to make a decision—he wants to find his biological father before he dies.
Determined to find his “real” father before he dies, Hae Jo sets out on a final journey.
Along the way, he does something unexpected: he kidnaps his ex-girlfriend, Jo Jae-mi, right from her own wedding.
Jae Mi, who grew up as an orphan, has always dreamed of having a warm and complete family. She broke up with Hae Jo in the past due to their conflicting life goals and Hae Jo’s unresolved trauma.
Now, just as she’s about to marry into a prestigious, traditional family, she receives crushing news: she has premature menopause. Her dream of becoming a mother—and building the family she always wanted—is shattered.
She hesitates about going through with the wedding. After all, her fiancé's family is highly traditional and places great importance on bloodlines and offspring. Jae Mi’s marriage is only approved because her fiancé lies to his mother, claiming that Jae Mi is pregnant. Without that lie, the marriage would never have been accepted.
And now, If they find out she can’t have children, the marriage really won’t be happening.
So when Hae Jo suddenly shows up and whisks her away, Jae-mi fights back at first. But over time, her doubts about the wedding grow. And Hae Jo… he’s there for her again—attentive, familiar, real.
Slowly, she starts to waver. Should she go back to the life she planned? Or stay with the man who once loved her unconditionally?
Hae Jo takes Jae-mi with him to search for his biological father. From medical records, he knows there are three possible candidates. So together, they visit each man—trying to subtly test DNA, searching for the truth.
But they’re not the only ones on the move.
Meanwhile, both the groom from Hae Jo’s previous job and Jae Mi’s fiancé are chasing them. Turns out, the groom isn't some ordinary rich guy, he’s connected to a gang. And having his bride kidnapped in front of everyone? That’s a public humiliation. His pride is wounded. Now, he’s out for revenge.
So Hae Jo and Jae-mi are on the run—searching for a father, facing the past, and rediscovering each other—all while time is running out.
Now the questions…
* Will Hae Jo finally find his real father? And how will that reunion feel—will it bring peace or more pain?
* What will Jae Mi choose in the end—returning to her fiancé or going back to Hae Jo?
* How will her fiancé & her fiancé’s family react when they find out the truth about her condition?
* Can two broken people heal each other, even if time is short?
* And ultimately, will Hae Jo find peace before his time runs out?
That's pretty much the story without giving anymore spoilers. Now what I like and don't.
What I like:
+ Simple story yet offer us many life lesson we can learn
+ Proof of first love is not easy to forget. Haha…
+ Jae mi’s fiancé's love & devotion for Jae Mi.
+ What a funny relationship that eventually happened between Hae Jo & Jae mi’s fiancé
+ The support friends that Hae Jo has around him.
Overall I'm quite happy to watch this drama…
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A great foundation of plot that failed to deliver
I went into Mr. Plankton with high expectations— a strong A-list cast, a story about loneliness and trauma, and a melancholic, reflective atmosphere. And honestly, the acting did not disappoint. The male lead, female lead, and supporting cast are all phenomenal. They bring raw emotion and depth to every scene, making moments of vulnerability, grief, and longing genuinely resonate. I loved watching them act— they carried the show whenever the writing faltered.Pros (What Worked and Made Me Care)
1. Acting That Pulls You In: Every single actor brought life to their roles. The male lead’s fragile, broken moments hit me, the female lead’s struggles were portrayed with subtlety, and the supporting cast added real humanity. Even scenes that should’ve felt flat still carried emotional weight because of them.
2. Themes That Could Hook You: The show explores loneliness, trauma, inherited suffering, mortality, and the search for connection. I could feel that this story wanted to be deep, and in some moments, it almost worked — especially when the characters reflected on their pain.
3. Atmosphere & Mood: I appreciated the cinematography and tone. The melancholy, reflective visuals and the road-trip sequences matched the internal journeys of the characters perfectly.
4. Emotional Peaks: There were moments that actually made me feel something— like when the male lead breaks down after being mistreated by a potential father figure. Isolated scenes like that reminded me of the show’s potential and made me wish the plot had been stronger.
Cons:
1. Rushed Plot & Arcs: Rivalries suddenly turned into friendships with barely any buildup. I spent 90% of the show watching the characters hate each other, only for them to magically become best friends at the end. It felt forced, and honestly, it annoyed me.
2. Female Lead’s Mistreatment & Unrealistic Decisions: Her struggles and trauma are often ignored or rushed. The abrupt shift from heartbreak over her previous fiancé to romance with the male lead felt unearned, especially considering how badly she was mistreated by him earlier. Her encounters with her biological parents are minimized, robbing her arc of emotional depth. These choices made her journey feel incomplete and frustrating.
3. Male Lead’s Lack of Growth: He’s supposed to be “broken,” but I didn’t see him really evolve. The unlikable traits stayed, and I found it hard to fully empathize with him.
4. Plot Holes & Inconsistencies: The male lead’s inherited disease and his search for parental love had so much potential, but the ending ruined it. The adoptive father who abandoned him suddenly becomes the source of unconditional love— like, wait, didn’t you ignore him when he ran away? It made zero sense and felt like a lazy shortcut.
5. Climactic Impact Undermined: The show clearly built toward the male lead’s inevitable death, but it didn’t hit. Too many rushed arcs and unresolved subplots left me disconnected. The emotional climax fell flat, and I couldn’t fully feel the tragedy I was supposed to.
My Personal Take: I really wanted to love this show. The acting alone is worth watching, and the themes are strong and relatable. But the writing just didn’t let me fully invest. Characters’ decisions felt sudden, emotional payoffs were skipped, and the ending undermined everything the story tried to build.
If you can watch it for the performances and mood, you might enjoy it. But if you’re like me and need plot coherence, earned character growth, and emotional payoff, you’ll probably leave feeling frustrated.
Bottom line: Mr. Plankton had a lot of potential and moments of beauty, but plot holes, rushed arcs, and unearned resolutions prevented it from becoming the emotionally powerful story it could have been. I loved the acting— I just wish the story had been as strong.
Overally, Mr.Planktoon's ending was rushed. As this plot's main focus of building up for that inevitable ending, isn't a good match.
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K-trauma that's makes you laugh through the pain
Oh boy, I didnt know what I was in for when I pressed play. Saw a few reviews where people titled it as K-trauma of the year. Ususally I am not that into the silly dramas, so I didnt expect to like this one very much. But damn, they did a fantastic job of balancing the heartbreaking moments and the funny ones. Everytime I laughed, it felt bitter. When I cried they tried to cheer me up with a corny joke.My favorite part was the ending tho. Even if it is bittersweet. They managed to wrap every storyline up and didnt leave a mess behind, which sometimes happen if you have that many characters. Regarding the more serious topics they navigated them very well.
The only thing that annoyed me at some point was, that I felt annoyed with different characters each episode. One episode I liked someone and in the next I was cussing them out.
All in all, this Kdrama deserves all the praise and in my opinion, is definitely a must watch for all Kdrama lovers.
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A beautiful chaos
If you are bored of same old romcoms then you need to watch this drama. It’s a unique story that is fun, full of adventure and equally emotional. The road trip adventure while being chased was hilarious, I enjoyed it. It is fast paced but gets bit slow towards the end.What I loved: The chemistry and love-hate relationship between Hae jo and Ja-mi was fresh. They couldn’t resist each other and fit soo well together as lovers. Although at times their relationship seemed toxic!
I liked heung’s character but his fate was same as every other 2nd lead. Some of you might not agree with me but I saw chemistry between him and Jae mi. Which was surprising because I never thought I will take him or his character seriously but I started to root for him somewhere in between the drama without realising that he is the 2nd lead. He indeed is a great actor.
The actress also did a very good job. She completely sold her character as jaemi, she felt too real.
One thing that I felt was incomplete is the underwhelming reunion between father and the son! Hae jo was looking for his sperm donor but eventually realised what matters is the person who raised him, the men he called his father! I felt like the reunion was really dull and short!! It should have been a big moment but there was no explanation from the father as to why he started neglecting his son!! Also I would’ve liked to see his little sister more. I really enjoyed their conversation. Johna by men 🔥 absolutely loved him.
Overall it was a fun watch last episodes got bit slow but still it was a fun ride.
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I’m UNWELL
Crying buckets, calling my psychologist as I type this xArt about the human condition and found families >>>
This drama is simultaneously heartbreaking and heartwarming, loved both the main and (most of) the side characters (they’re all three-dimensional and complex) and the acting of everyone. The ML is on another level.
What I love the most is the portrayal and the different storylines about all of the complicated relationships and how they evolved and were wrapped up.
(rewatch value low bc I value my mental health)
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In the End, He Was Loved
The story was tragically beautiful—like a flower blooming in a war zone. It made me laugh, cry, and burn with quiet anger. Hae Jo’s life? Pure heartbreak. Abandoned by the people who were supposed to love him first. Homeless, drifting, dying before he even really got to live. Not even knowing who his real father was… just wandering through life with bruises no one could see.But at least… at least along the way, the universe threw him a few lifelines.
A noona—Bong Suk—who gave him a roof, watched him grow like a wilted plant reaching for the sun.
A chinggu—Kkari—someone who stood by him in a world full of shadows.
A girl—Jae Mi—who loved him with everything she had, even when it hurt.
And a hyung—Eo Heung—who quietly, fiercely cared. Who caught him when he fainted, wiped the blood from his nose, fed him, and comforted him like no one ever had.
Hae Jo and Jae Mi’s love? God, it was like watching two broken mirrors try to reflect light. So haunting how they predicted each other’s fate:
When he said, she’ll never be a good mother coz she never got to feel what it’s like to be mothered.
And when she whispered, he’ll die alone, on the street, with no one by his side.
And then, years later, their words became prophecies.
She found out she couldn’t be a mother.
He found out he was dying.
A match made in hell.. in the cruellest corners of fate. Two cursed souls crossing paths in a world that never showed them mercy.
Ko Ahjussi? Ugh. Had me fooled. Thought he was Hae Jo’s real abeoji—only for the truth to slap me in the face. Just another madman in the mess.
But Heung—sweet, soft-hearted Heung—his love for Jae Mi was pure. And Jae Mi? Even when Hae Jo tried to push her away, she kept coming back. Because she loved him enough to stay, even if it meant breaking every time.
And when Hae Jo finally reunited with his real father… that moment was everything.
But nothing wrecked me more than hearing him whisper, “I want to live,” right before he died.
If he got to replay the most beautiful 7 minutes of his life before it ended… I know exactly who’d be there:
Jae Mi.
His noona.
Heung hyung.
Kkari, his chinggu.
And his real abeoji.
And maybe, just maybe, for that brief flicker of time, he felt like he belonged. Like he mattered.
Even if the world was cruel—he was loved.
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You should watch it if you want to cry a lot
This was definitely worth watching, it was awesome. I would rewatch again. Yet my favourite thing about this drama were the actors and the OST. The fact that they got two of my favourite actors in one k drama is crazy. I've also added California Dreamin' to my stotify playlist. I absolutely love this song. The ending was sad, but it was expected so it wasnt like VERY sad. Lee Yoo mi never has a good ending in any k drama 😭. It's either she dies or somebody she loves dies. Anyways, i recommend watching it, it's really worth it! 👌🏻Was this review helpful to you?
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Two unfortunate lightning rods that are crazy, stupid in love
For me Mr. Plankton was a really quick watch (1 and ½ days). The 10 episodes were reminiscent of the fleeting time Hae Jo and Jae Mi had together. Overall, the acting of all the actors was outstanding. Their dialogues, eye contact, body languages were all spot on. It really made me get super into the story. Although the story was so touching and made me sob, I definitely wouldn’t rewatch it. There’s too much trauma. I think this is definitely a one-time kdrama. Not a feel good one for sure.Themes/story:
I think what “Mr. Plankton” really taught me is to cherish what you have in the present. Stop trying to fulfill dreams or aspirations that will only harm you. I saw this with Heung and his family lineage, Jae Mi’s dreams of becoming a mother, and Hae Jo trying to find his biological dad. All these things were painful subjects for all three characters, bringing them more suffering than actual joy. And in the end, neither of them were able to fulfill their goals. I think what this kdrama is trying to tell us is that your time is fleeting on this earth, just like plankton in the ocean. You make your oxygen and then you’re gone. Make the most of it while it lasts and enjoy even the obstacles that come your way.
Characters:
Hae Jo: Tough and charismatic, Hae Jo is the definition of a “bad boy”. I think his quirkiness and free-will for his life stems from having been neglected by his parents as a child. He pretends to be a tough cookie, but in reality craves attention and love. His only real way to deal with pain and suffering is to push those he cares about as far away from him as possible, resulting in them suffering more. Hae Jo deserved a better life, but he was never really given the chance to fully experience it to the fullest. Just as he was beginning to understand what true family felt like, he could no longer stay for much longer. His character really created a pit in my stomach because while he is toxic and harmful towards a lot of friends, he experienced a lot of really unfortunate events.
Jae Mi: Not much to say here. Stereotypically bright, sunny girl that brings joy into everyone’s lives. She’s a ray of sunshine for everyone around her. I think she also craves love, just like Hae Jo, making them the first storm. Their yearning for affection sort of overwhelmed them. This makes it super hard for the both of them to separate, while they also simultaneously hurt each other, especially Hae Jo. Jae Mi honestly deserves all the best in the world. Her one wish to become a mother couldn’t be fulfilled, and then her soulmate passed away.
Heung: I love Heung. I think he's really slept on character. Having already seen Oh Jung Se’s acting in ‘It’s Okay to Not be Okay’, I knew Heung was gonna be a great character. Heung is a character who really finds confidence in himself. Although spoiled and cherished all his life, he never truly knew who he was as an individual because he constantly lived by clan rules, and his mother’s guidance. Even though Heung was also going through loss in the story, he didn’t let this misguide him and corrupt his heart. He remained pure and sincere to Hae Jo and Jae Mi, never letting his pain hurt them in any way. He even comforted them along the way, showing true bravery and compassion.
Bong Suk: I LOVE Bong Suk. She is literally everything: a diva, a baddie, a tough mom, a super caring woman. Her charisma and sarcasm perfectly matches Hae Jo. Her dynamic with him is also so funny. Even though she pretends to be super tough and mean on the outside, she cares deeply for Hae Jo and anything troubles he goes through. I adore her. 10/10 character.
Other comments:
- When Hae Jo reunited with his old dad, I literally broke down. I think that was the scene I cried the second most (first place obviously goes to the last scene)
- The ending scene is literally HEART BREAKING. The visuals of it, the music, the acting. UGHHHHH. It hurts everytime I think about it. I can still hear Hae Jo whispering “I love you” to Jae Mi.
- Hae Jo’s lackey is so funny
- The song “California Dreamin’” will never be the same
- Why did Hae Jo’s dad just accept him again? Did he realize he was wrong?
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intricate weaving of love becoming selfless
tl;dr i might just kms idk-`♡´-
i enjoyed the story a lot, i loved how in the end the father that hae jo found was not the one who created him but the one he wanted to see the most even if he is a 시발개새끼, at least he found some closure and so did his pos father 😒
i enjoyed seeing the dynamics and growth of the 3 main cast as well as their increasing fondness for each other and how they reach maturity within themselves thru their adventures and struggles. and how hae jo still had lots of people around him who cared for him and would CARE FOR him like family would.
since the beginning i was dreading any scene with snow LMAO but they did wrap it up nicely given there was only 10 eps. lots was happening but it didn’t feel too rushed and i think the amount of episodes was just right
i also didn’t mind the fact that they didn’t expand on john na’s character LOL the air of mystery was fitting but i need to let y’all know i’m a #greysanatomy girlie so i love him a lil more than yall do 😜
the emotion was so raw and we got to see the perspectives of hae jo’s lover, mother figure, father figure, work partner, rival, and how they ended up making a found family situation which i always personally love to see 🥹
i love how it ended with hae jo’s smile and even though he has regrets and wants more out of life he knows that he’s lived a beautiful life and he’s loved endlessly 😣💕
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Living a Life!
It’s been said to live each day as if it were your last. What would you do if you found out that you only had a limited amount of time left? The irony behind that question is that EVERYONE has a limited amount of time left to live. The most important question is how are you living? Most people in this world use a life to live rather than living a life.Hae Jo is a young man who finds out that he’s terminally ill. His life has been full of suffering and dealing with abandonment. He’s constantly pushing away anyone who gets close to him because he feels he’s unworthy of being loved. He lives a life doing odd-jobs which often get him into trouble. He doesn’t care. After all, what’s the point? The only jobs he doesn’t take are missing persons or killing someone. Anything else is fair game. The irony behind not taking missing persons cases is that he, himself, is a missing person. Hae Jo is a young man who lives recklessly, not caring what he does or who he hurts.
But then, of course, as soon as he finds out that he has maybe three months left to live, he sets out to find his father who turned his back on him as soon as he found out that he wasn’t Hae Jo’s biological father. I’m still reminded of the classic line from “Boyz N’ the Hood” that any fool can make a baby but only a real person can be a parent. Hae Jo’s mother committed suicide, and his father ignored him. Hae Jo decides to take along the only person he’s ever loved and who has ever loved him: his ex-girlfriend, Jo Jae Mi, who is, herself, an orphan. These are two lonely souls who can only seem to find love, peace, and solace in each other. But Hae Jo is still too afraid of being cast aside yet again.
Jo Jae Mi is young woman who is trying to find some kind of love and companionship. She’s set to marry Eo Heung, the son of a wealthy woman. However, as soon as Jo Jae Mi finds out that she has pre-menopause, she realizes that her potential marriage is doomed. The other factor here is that, even though she cares deeply for Eo Heung, her true love is Hae Jo, who hysterically shows up at her wedding and kidnaps her! Make no mistake, this is a black comedy with some serious drama thrown in. The Koreans are masters at utilizing multiple genres within a single series.
Jae Mi, who is a reluctant passenger at first, finally agrees to help Hae Jo find his biological father, which turns out to a funny road trip around Korea with these two going through one adventure, or even misadventure, at a time! They fight, they quarrel, they love, and yet every time Hae Jo tries to push Jae Mi away or abandon her, she keeps coming back. Throughout most of the series, Jae Mi has no idea that Hae Jo is dying, and it’s tough to watch her reaction as soon as does.
Hae Jo is a man who uses his last three months to the fullest. He learns how to live without caring what may or may not happen. The title of this series is “Mr. Plankton.” Plankton may be considered the lowest among the food chain but its vital part in providing life to so many sea creatures cannot be ignored. Hae Jo is like plankton. Not only does he learn to live his own life, but he helps others do the same. What is true incredible, is that he doesn’t realize the level of his importance or how much he means to others, despite the fact that his own family deserted him. His family now consists of Jae Mi, Eo Heung, Bong Suk, and his partner Yoo Gi Ho.
Jae Mi is Hae Jo’s rock. She’s unwilling to let him push her away. Now, that’s a true companion! Someone who is willing to be there for you through thick and thin. It’s incredibly sweet when she confesses to Hae Jo that he’s always been her true love, and he confesses the same. While it may not be conventional, this is true, unconditional love at work. Neither one cares how the other lives their life or what faults or issues the other has. This type of love has a way of permeating everyone else around them as Eo Heung and his mother finally understand what it means to love. True love is never about holding on, but about letting go.
At only ten episodes, it feels like sixteen. That’s not a bad thing. The writers were brave enough to stick to the character and story. No sudden miracles were to be found here, unless you count the miracle of two “lost” souls finding love in themselves and in each other. After all, isn’t that the true point of life and love?
Performances in this series are nothing short of tremendous. I really have to tip my hat specifically to Lee You Mi, who has true chemistry with Woo Do Hwan, but it’s the power of her feelings and her despair that really capture the viewer. After all, she has to show us how much she loves Hae Jo, and how her life might be after he’s gone. She has that cute, sweet smile, but when she’s sobbing, it’s heartbreaking.
I’ve seen Oh Jung Se in a number of series now, with “It’s Okay to Not Be Okay” being my favorite. He’s a veteran actor who can tackle anything. He played the “mama’s boy” to perfection as well as showing us an almost boyish love for Jae Mi. However, he’s careful not to make Eo Heung the villain of the story. In many ways, I was cheering for him as much as I was for Hae jo. Eo Heung is a man trying to escape his mother’s coattails and learn how to finally live for himself. In many ways, his character evolves the most in this series.
This is a tremendous black comedy series that will likely have you laughing and crying, perhaps even within minutes of each other. Now that is fantastic storytelling! It should also serve as a reminder to us all to start living a life!
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