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So... Chanyoung (redhead) is revealed to have been a casual sex partner of Jeongyoon's a while ago, who realised that Jeongyoon was infatuated with Hyeonsoo but couldn't gather the courage to talk to him. He was jealous of Hyeonsoo, because how dare a straight guy got all the attention when they weren't even friends, so I think that's why he asked Juyeon out, to hurt Hyeonsoo since he had a crush on her. That's why Jeongyoon is hostile towards him, it seems like Chanyoung only likes men so he's wondering what a gay guy wants with a girl, and Chanyoung is wondering why Jeongyoon can't give up on a straight guy.

when will red head’s relationship with ml be revealed