Yaoiforever1's Favorite

Spoilers
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I've accepted that JaewonXKaram is end game, but why did the author put so much effort into Junseo? She even had a whole flashback arc to fill out his character. In fact, he's more fleshed out that Jaewon is.

Why put all that effort into Junseo if he wasn't the main love interest? At the very least, Junseo deserves a happy ending/spin-off because all fans (whether they root for Karam or not) have become invested in Junseo.

He’s latched onto Bum as a sort of really fucked up maternal figure as well as a punching bag and a stress reliever. He’s grown attached to him in such a way that he clearly demonstrates multiple times that he would flip his shit if Bum somehow got away from him, whether it be by dying or actually escaping.
I think that he’s realized the power Bum has over him at this point and he does not like that. He also sure as Hell doesn’t want Bum to figure out that he now has power over Sangwoo.
These past few chapters have mostly consisted of Sangwoo thinking and coming to conclusions. Us as an audience haven’t seen what conclusions he ended up coming to but I don’t think it’ll be good for Bum.
I predict that at some point in the next few chapters he will do something to both “put Bum in his place” and to try and minimize the intense and unhealthy attachment he’s developed to Bum.
I think his “I win” comment might be talking about winning against Bum in an attempt to regain power over him.