am I supposed to like Ik-Su?

Because even if they were just best friends, he's a terrible friend. He bails on a years-long tradition like it means nothing without even mentioning it until the last minute, proceeds to basically ghost Dohun with no explanation every time he reaches out, then gets pissy when Dohun has the audacity to try to talk to him to see what's going on. And when he is finally forced to talk to Dohun, he totally invalidates his feelings, like being upset about any of it is just some childish whining that doesn't even deserve a response.

None of that has anything to do with whether or not he has a boyfriend or whether he and Dohun have feelings for each other - if he was dating a girl or just hanging out with new friends it would still be serious asshole behavior.

I don't hate him, it's understandable that he'd want to take some time to explore his sexuality, and the guy he's dating is high key a creep and is definitely manipulating him. But how he's treating Dohun AS A FRIEND really rubs me the wrong way.