Responses
True, I can't see a world where Siwoo actually develops feelings for him considering (a) his terrible background with the MCs of the main story, (b) how he kept blackmailing Siwoo despite realising he has feelings for him, and (c) injuring Siwoo.
I can only see it if red-head actually works for it, which he never did. I don't think the surprise butt-sex counts.

I was aware he'd get rejected and I was hoping he would be rejected as well, but damn that lil' monologue at the end got me punching the wall. He deserved that ending but dear lord, it hurts nonetheless.
However, I do like how the author still kept his red-flagness despite it all indicated by the delulu part of his speech (Siwoo liking him back but rejecting it, and promising to keep on pursuing him.)
Anyways, good read!