Help!! I don't remember what this was!!

Okay, so it's bl and a manhwa. There's this one scene where some dude part of the club the ML was in finds out he's gay. So he shows it off to the whole club. The ML gets pissed. After the whole thing the dude leaves and the other club members tell him that they didn't expect that cause he's usually so chill and you know popular guy, seeing him get so mad was unexpected. I thought it was Semantic Error at first but it never even happened some weird Mandela effect. If anyone knows it please tell me!!!