Aramintai

So, is this gonna be the overall plot? I'm already seeing how it will gonna go.
FL will do backstage singing for Ran Joo to try to help her sell albums. Then of course the villainous CEO will eventually expose them. The girls will get vilified, but then the brothers will release their sappy sad stories and they'll get sympathy from the public and album sales will skyrocket. Ran Joo will retire to become entertainment agency CEO, FL will get her audition and a chance to be a singer.
The only thing I'm unsure of if whether that's her longtime dream and whether there'll be any romance since all its tags were removed.

Couldn't care less about Ki Ho's identity (though it's clear it's Bo Geol), dunno why it's a more popular discussion topic than the rest of the drama. Clearly it was put in for angst, added mystery sub-plot and potential future trouble from his dad. Why would a normal guy hide his identity from FL like that is beyond me, especially seeing how she still sorely misses him and wants to find him. But I'm sure we'll hear some cliche explanations that he thought he had let her down and doesn't want to face her because of that or something.

It's either Kang Bo Geol, or none of the brothers.

You can start preparing already. Woo Hak is just a empathetic confused amnesiac, but Ki-Ho is his brother. Too many clues pointing to this if you're paying attention.

If they gonna do the pity party for Ki-Ho's dad I'll be disappointed. People like him deserve no forgiveness. I can very well understand abused children cutting all ties with abusive alcoholic parents. It leaves a deep trauma and very bad memories, which cannot be erased by simple apologies and pretending to be a changed person.

So what Ki-Ho's father is up to? Ki-ho is an adult now, if his father tries to raise a hand on him again he'll just get beaten and/or reported to the police again. I doubt it's money either. Is he gonna try finding his runaway wife through him? Again, Ki-Ho will just beat the shit out of him and get a restraining order. Either way he'll either end up in jail, or, if he's sane enough, alone with no family.
The real villain is R&J CEO who wants to block Ran Joo from releasing 20 million album copies and getting half his company's shares. And he looked such a nice guy in the past.

Watch Mr. Queen and Kingdom. The best of them all. But those are from yesteryears.

The king is the only character that I like here, he's hilarious. He's so down to earth and to the point.
His actor also frequently plays butt of all jokes characters be it good or evil, so he's good.

It is cringe. But the main problem this saeguk has barely anything going on in it plotwise. So actors have to spice up things however they can with their acting.
Matchmakers uniting to wed some spinsters so that sickly king's son can marry? Joseon's 1st world's problems. Hard to relate. Also, ML getting horny reading those timid book series is just double cringe. There were plenty of brothels and entertainment houses in Joseon era which he could have frequented whenever he wanted like many other married men at the time. The guy's just a prune. Him being a huge narcissist doesn't help either.
Saeguk writers are running out of ideas lately. None of the latest ones are a hit.

Rowoon still keeps on playing ML from Destined with You. Same aloof, slow speaking amplua. Can he act something different or this is it?

Yea, I'm thinking so too.

Yea, small drones usually don't have such large coverage areas. You'd need drone signal boosters installed at regular intervals along its flight path.

Good catch, going to the Navy for obligatory military service really fits. And also it was Bo Geol who regularly went to various islands for trash collecting volunteering, likely with tiny hope of finding FL, his brother just tagged along last time. Ki Ho is definitely Bo Geol .

It's a red herring more likely. Way too obvious. Ki Ho is his brother most likely.

Just an educated guess. The more kdramas you watch, the better you can predict how it's gonna go...

So basically, Ki Ho is Kang Bo Geol. He has found his real mother in Seoul, but stays quiet for now for some reason.
His brother is likely the adopted one, he has abandonment issues and identity issues because of his amnesia trauma. And after hearing FL's story he has started seeing similarities in everything and having a case of mistaken personality, thinking himself as Ki Ho. It doesn't help that part of the similarities are related to his new family and are true, but concern his mother and brother.
One viewer below rightfully referenced What's Wrong With Secretary Kim? - same thing happened to brothers in that drama as well. The bad things happened to ML, but his brother associated everything to himself because of his severe mental trauma due to extreme guilty conscience. And ML stayed quiet there as well, getting abused for nothing by his confused brother.

EDIT: To add more credence to this theory, a viewer above called out the fact that Ki Ho was in the Navy military at some point (probably obligatory military service) and it was Bo Geol who regularly went to various islands for trash collecting volunteering. His brother, on the other hand, has sea sickness and only tagged along with his brother for the first time.

Why not?

Kang Bo Geol is Ki Ho 100%. The brother has misplaced identity syndrome.
Also, if they go the tropey way it's gonna be a love triangle between FL and two brothers.

Btw, child version of Ki Ho was played by the child actor who played child version of ML there. How fast they grow...

The editor one, Kang Bo Geol. But that's just my guess.

But she's not an athlete. And I don't think this is a good enough of a headcanon.