Halsyeon

It seems to me like yes there's more going on in 2021 that she needed to do. One being to get Saeha to also travel back. I think yes her changes in 1997 did make it to where it was uncertain whether she'd be born. But I also think she killed the janitor because he's not Manok's real father and was possibly a danger to him in the future.
I think the biggest downfall of this entire series and the answer for everything being so vague is because we're seeing the story from Saeha's point of view. If we had been following the Ghost's storyline we would potentially know more. Instead we only got snippets of her life and what she did in Saeha's timeline. Even when we got a little more info on her in 1997 we only got it because Saeha went back there. I'm not saying I don't like Saeha or his story either I just think we don't know much because in all actuality Saeha never knew much either.
And I think its sad much like Saebyeok said in the last episode, his entire life was ruined because of the Administration Bureau. They made his dad out to be some sort of hero but really thought of him as a murderer. In the first storyline we got they even covered up his death so much that nobody really knew he was dead. This event caused his mom to slip into depression. And then Saeha dies because of them and Seonwool's plan to lure the Ghost. And the fact that she seemed to show no remorse is awful.

Yeah the janitor was not his real father so his lineage is unexplained. And I'm so confused who they are gonna make Saebyeok's baby's father. Eojin clearly still likes her but she doesn't want to get back with him. He kissed her and they cut it off like...wtf. That scene lead me to believe he'd be the father but then he didn't even know the babies name so?? Unless she got pregnant with him and ran off and didn't tell him. But that doesn't seem plausible in my opinion.

It very well may break down again given it seems to at the very end of episode 10. I have a feeling they have to prevent many things from occurring up until the Ghost is old enough to go back in time. If you think about it any little thing different that happens to her and her family up until that moment jeopardizes her going back. Which is why I think she's trying so hard to prevent Manok from being caught. But it seems he dies anyway? Its so confusing. I mean honestly if you also think about it maybe she was keeping him alive so he'd die in that moment he does? Idk there are so many unanswered questions and a lot of them to be honest came from the last episode. They should've left some of those new questions for another season in my opinion. This easily could've been a 16 episode drama that was a one and done season had Disney+ not been the distributor. I also hate the one episode per week format. I've forgotten a lot of what happened in episodes 1-5 because its been so long lol.

I thought the DNA test was proof enough of why she was there.

I think she killed the janitor because Manok is her distant relative. Maybe the janitor was abusive or causes Manok to die in the future. We don't know. Manok is on the Ghost's father side of her lineage. Saebyeok is on her maternal side. So she needed both to live in order to be born. But Manok may have died and it seems it didn't effect her. Maybe he's more distant of a relative than she thinks.

We do know why she's in 2021. She's trying to keep both Manok and Saebyeok alive because of her lineage. If she's not born she cannot go back to 1997 to create the Grid. I'm sure there's more to it though. However, if Manok died from Saebyeok's gunshot maybe something changes. It seems like Saebyeok is more closely related to her. I feel like Saebyeok could be her grandmother but that's just my guess.

In the Ghost's timeline, the Grid is in place. She says in episode 10 that a lot of people would die if it weren't for the Grid. Her whole storyline in the show is that she has to make sure her ancestors live so that she's alive to be able to go to 1997 and set up the grid. We've seen the world without the Grid so it makes sense.

Saeha's Timeline is pretty much what you said except he's always been with the Ghost in 1997 because of him stealing her tech. We just didn't know that at the beginning. Ghost says in episode 10 that they have together tried a dozen different scenarios in 1997 but the only one that worked was the one where his dad died and Manok's father, the janitor, also died.

No Grid timeline the parents are alive but the majority of the world is now suffering due to the sun's flares.

Final Timeline something unforeseeable happens due to another Ghost appearing. In episode 10 we get a flashback to the female Ghost and Saeha talking where he finds out that in the future he's also going to die. The Ghost also tells him what I said above about them trying a dozen different scenarios in 1997 but ultimately it goes back to the same scenario. She tells him it's up to him what he does to save his mom. So in that same timeline (the original one that we started in), he goes to his mom before she tries to hang herself in the bathroom and prevents that from happening. He also leaves her a pamphlet for her to seek out help. So, she doesn't go down the same path as before. Also now that Saeha was visible in the camera footage the AB assumes his father had something to do with the janitor's murder but turns him into the Grid creator because the Ghost used his card to access the system.

In the final timeline, we meet a second Ghost who in my opinion is also trying different scenarios to do something of which we don't know yet. He's the one who bumps into Manok and takes the tracker off of him and puts it on the delivery guy. He also seems to be the one who turns back time the first time Saeha dies so that Saebyeok becomes involved in the scenario as well. Not sure if this Ghost was trying to make it to where Saeha lived and Saebyeok doesn't or not yet. Then both of the Ghosts were there when Saeha dies yet again. There to me it seems like a Third Ghost tries to intervene because both the female and male ghost move over Saeha and exchange words where the male ghost says in English that it wasn't him doing it. I'm not sure if the third Ghost was trying to turn back time to save Saeha and the two of them were trying to prevent that or if they were trying to save Saeha and the Third Ghost was trying the opposite. There's a lot of confusion in that scene.

They were just setting it up for a season 2. They definitely didn't answer anything to keep us hanging. We do know that there are at least 3 Ghosts though.

So I don't completely understand everything and I don't think we were supposed to because they set it up for a second season but there's more than one ghost. I think at least 3. The female ghost (Lee Siyoung), the male ghost (Lee Kihong), and from what I could tell a third that could possibly be the older guy near the end of episode 10.
The female ghost spent the entire series making sure she was born because if she wasn't no one would be there in the past to set up the Grid to work the way it's been working. So therefore she tried to keep both Manok and the police officer alive. And in order for the world to continue that way Saeha had to die. So we see that happen the first time around but the male ghost (Lee Kihong) turned back time (Time doesn't flow linearly in this drama so idk how to explain it other than he turned back time) and then the second go around happened where Saeha again dies but this time saving Saebyeok. When Saeha dies again it seems like they tried to turn back time to save him but it didn't seem to work because a third person (a third ghost) was interfering. Yet he's alive again at the end so maybe they did save him and faked his death? Idk. I was not expecting them to set up for a second season with so many unanswered questions. The baby Saebyeok has is related to the female ghost so they are trying to protect it. I'm not sure if Manok dying messed things up or not yet.

But yeah the main take away I think we got from this season is that time isn't linear. The Administration Bureau doesn't care about the lives of their own company. Saeha's death was nothing to Choi Seonwool, neither was his dad's. I'm glad at least Eojin and Jongyi seemed to show remorse. I think we're supposed to get that the Admin Bureau aren't the good guys but aren't the bad guys either? There seems to be somebody out there worse than them.

Too many unanswered questions for a drama that hasn't been confirmed to get a season 2. I'll let it slide if they confirm a season season because I am curious about everything after the ending of ep 10 but yeah...it was a mess.

Lol 100% they planned for him to escape. They put that tracker on him so they can follow him. He's definitely bait. Though I'm not sure that'll outsmart Ghost still.

He went back to save his father whom he knew was killed by her and mother. Because at the time he thought the Ghost injected something into his mother. It was later revealed to be a vitamin though.

You should probably mark this as a spoiler btw.
That's because it was never really Saeha. Saeha was just pissed because his dad's death was completely covered up by the Janitor's death. So because it was covered up everyone just assumed his dad was the janitor and that he was the janitor's kid. When it was revealed that his dad also died that same night because of the Ghost is when the audience is let in on the fact that he's not the janitor's son.

Okay so the security guard knowing it is him from back then is slightly concerning. Ms. Choi being alive is great news but also concerning given she suspects Saeha's dad of murdering the janitor. Manok is the janitor's child. We have some answered questions but still need:
1. Why is Ghost doing what's she's doing?
2. Why is she so ill? Why did she have to kill the janitor to not turn into ash?
3. Did Ghost get caught on purpose? She seems less ill now after the entire thing. Maybe she got caught to get the injections?
4. What is Eojin's whole purpose? He seems to know more than we've been led to believe.
5. Why is Ghost so concerned with Manok? A mere murderer shouldn't concern her in the long run if her main goal is keeping the Grid up and running. Yes he's the son of the mad she murdered but still? Why?

I think Kim Manok is his son because when Saeha accidentally burns the kids eye in that same universe Manok's eye is burned as an adult. Security guard is being weird because he recognizes Saeha from when he walked in on his dead dad.

You can watch on disney+ if you have a vpn too btw.

Technically Goo Ryun was only repeating the words the girl had said to herself in her memories. I think sometimes we get stuck in negative thoughts that outweigh our positive ones so she was repeating them as someone from the outside so the girl was hearing them from someone that is not herself to bring out that she did in fact want to live even though dying may have relieved her from her pain. I don't completely agree with the way it went down either but I feel like that's why Rowoon's character is there. We already know that the suicide team's success rate is not good so they obviously need to learn a new strategy and it shows that Rowoon's way of compassion works. It may be that these people in this heaven/hell of sorts haven't been around humans much anymore, they seem to not have to worry about bullying and such themselves so maybe the help of someone who is technically still human (or half human as they call him sometimes) can help them more.

I think that's the point and reason why their department isn't as successful as they want it to be. I think Rowoon's character will add in the compassion and helping hand they need to start saving more lives and have a better success rate. I feel like Koo Ryeon had something happen to her in the past that has struck her in this mindset that she has to be this way but clearly there's more to it than just bluntness because that didn't fully clear the girl from being suicidal. It took Rowoon's extra step to completely clear her.

The Uncanny Counter was so good in the first half. The second wasn't bad but failed to get me like the first half. Regardless I finished it and I'm hoping season 2 will redeem the drama for me.

Well I'm loving the Memory scenes. They are very cool. Can't wait to see where this goes!

I think it'll be like how they did in The Uncanny Counter or Doom At Your Service. Where religion is present but not the main topic if that makes any sense? But can't say for sure. Though in this episode they do mention Junwoong switching from Buddhism to Christianity due to a job interview for a job where the people were mainly Christian. He later thanks both Jesus and Buddha when he thinks his life has been spared. So there's also that.