Istg if dante rapes him fr and gets away with it cus it was all to keep gino "safe" I'll crash out
I'm 100% sure the end game is sehyun and jinwoo. The Itae dude is probably the "it was a game at first but now I'm actually in love with you" type of character that will definitely lose the end game cus he fucks things up/isn't the lead chosen by the author.
Also the leader is definitely the stalker and the one behind that hate account. It's been mentioned a lot of times that he was a trainee the longest and had some talent in composing and singing.
There's also the fact that jinwoo was the only one who got an offer for another company and was the centre of the group. The leader probably got all jealous and shit and hence the hate account, cus most of the tweets are just berating jinwoo for forgetting about the group members and going ahead in his career despite not deserving all these chances. Treating jinwoo all nice and stuff might just be an act to keep up his "kind leader" persona.
I actually have another theory that he actually liked jinwoo however he probably realised jinwoo didn't like dudes at all (haha maybe jinwoo did his usual "I don't speak with ugly guys" antics) or smth and now he's just clinging and spiralling down in jealousy.
Welp that's all for my theories. Wonder how much of it will turn out to be right
(Also sehyun has to quit that company ASAP)