
Well for one thing I think him catfishing is not from a malicious reason, but him doing it is still wrong. I believe that when someone does something bad it doesn't necessarily meant their bad. I just think that he has a crush on Kosaka and is catfishing him since he's aware that society doesn't do well with men x men or that Kosaka might end up hating him. And that his girlfriend knows(or has a 'feeling' about it). Or I'm just thinking too much on a whole idealistic level that everything is just rainbows ans sunshine. And that it might just be Seo catfishing him for fun. I would rather think of it as the first one rather than the latter. ╥﹏╥
Sensei you gotta help Seo too...