Spoiler too :
I got mtl but what understoo was like, sunbae was trying to get hold on to Iksu... they were clearly going to break up ... sunbae showed unannounced at iksu house and while he was out dohun came to tell him he wouldn't lose the fight of judo but sunbae was the one who passed the message to iksu.
So Iksu runoff to talk to Dohun. Then sunbae followed him and caught them saying they kissed before ( dohun was the one who kissed iksu outnowhere )
Sunbae gave Iksu a ticket to a concert or something that was on the same day of Dohun match and Iksu was kinda going to break up with him at the time but Sunbae told him to hold on that ticket and he wait for him ( my guy ... just give up ... he was gonna break up because he doesn't have feelings for you ... why torture yourself ... )
Dohun got mad that Iksu was considering not going to his match because it was a promise they made, that Iksu would always go to cheer for him. And none of the three of them spoke with each other until the day came.
Obviously Iksu choose Dohun and they got together right away.
Wich i also thought it weird that he took this long to decide because Iksu was clearly going break up with Sunbae before, i think he decided to think seriously in respect of Sunbae feelings ...
I feel bad for the boyfriend I mean sure I guess he should take a hint and move on because these two are very obviously more than friends, even if they haven't come to that realization yet, but I get that he really likes him and since he's already in a relationship with him he wants to hold on to that as much as he can. Truly hope he meets someone nice but from what I've seen in the raws SPOILER : it kinda seems like the guy just ditches him to run to his best friend and it ends with them having sex so yeah yikes for him