It’s crazy because the author is giving it all to make the Sunbae look like an asshole (changing his facial features, making him cheat etc) but it’s still not convincing at all. Homeboy was hypnotized and probably doesn’t even remember having sex with someone else. And how is him saying something a bit hurtful more awful than Woojin being a Megatron 2000 S** abuser ? Idk I'm still not gonna side with him.