
I might be crazy fro saying this but I think it's Ido's bro that was in the past treating Sejin like a shit and Ido was watching on the side (I mean, he witnessed and can't do anything). Why? First, maybe it's just me but when I saw Ido's bro, I thought it was the angry Ido. They're really alike, appearance wise. I can't really tell them apart until when I saw them together (when their family is entering) BUT ITS WAS SUBTLE DIFFERENCE. Second, Ido's been dropping clues that he knew the past but there's was no sign of him doing repentance actions. Like, when he said 'Ive been longing for this for a long time' (non verbatim) when they first met, it was as if there's no way he treated Sejin like shit. Like, he's waiting for this moment to treat Sejin better because he's always been mistreated. AND, if it was Ido who's the shitty guy in the past, HOW WOULD HE KNOW WHAT SEJIN LIKES AND WANTS? If he's mistreating Sejin, how can Sejin brought him to Han river? Thought him french? The bathroom style? The garden? The preferences? I mean, if Ido hated Sejin, why would he spent time listening to Sejin? And the flashbacks on Sejin dreams doesn't match up with Ido. In Sejin's he's being mistreated but in reality they're doing fluff things and Ido predicted things as if it was aligned with the past. If it was Ido, HOW CAN HE MISTREAT SEJIN WHILE BEING GOOD TO HIM?!.
Okay, it's time for me to touch some grass

I like this theory. Maybe Sejin just went through so much trauma that he lost his memory since the guy in the bathroom was like "you don't remember me?" But that would mean the brother was seeing Sejin in secret and only Ido knew because the rest of the family didn't seem to know Sejin at the engagement ceremony. My initial theory was that this is another life. In the first life Sejin and Ido crossed path, and Ido couldn't do anything to help Sejin when he was being abused. ╮( ̄▽ ̄)╭

SPOILER
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The brother raped sejin and ido did too afterwards. Ido loved sejin but after he was raped by the brother he assumed what happened was consensual. After this he became obsessive and hateful to him because he thought sejin didnt actually love him then he raped him. when he learned the truth it was too late sejin killed himself for everything they did to him. Its really tragic

He never cried in front of them (ofc minus the times they graped him). It's funny how they felt bad at him for crying like that in this chapter but not an ounce of remorse when they tortured him. Acting like they care when they're just feeding their half assed conscience.
YG is not strong, he was never strong. He just want to be with his brother, his only living family. You see, he doesn't have any interest on being a pro guide, he's just thankful that he's able to help his brother. He joined this BS org to save his brother, went all through that shit etc all for his brother. That's the plot.
They all knew that. YG is vulnerable. He's feigning strength to protect his brother and they took advantage of that. Sadly, that's also the plot.
I don't want any redemption arc. Where at the point of no return. All redemption that may happen in this story, will just be a pathetic attempt to somehow create romance. In side stories? Sure, there could be romance if its an alternate universe where YG is happy and well treated but as an ending for the main story? Absolutely not.

I just remembered that Sihwa was a failed experiment like there's something went wrong with him. I'm probably overthinking but I think he's really dying or he's meant to die in the first place (y'know he's a failed experiment) plus he was made to be Si-in and Si-in was terminally ill so maybe they also made him ill??
I haven't seen anyone mention this, their work dynamics is so. Their whole department? That's my ideal workplace suhshs. Their workplace is like idealistic and realistic at the same time. Like, there are some tensions especially when their opinions don't much but they are super professional. I just love not only the couple but also their co workers . I want more of themm.
Ps: I hope there will be a chapter where they'll announce their relationship with themblbsnsns
Fuck Hyunsoo's former department