Forgot tittle

It's a BL manhwa
MC/uke attended a party/banquet, (he's overseas btw, maybe US i forgot).
He got really drunk and came across ML/Seme, ML/seme is in a big room playing a grand piano and they had sex there..
Next morning, MC/uke ran away and decided to go back to korea to atttend K university, turns out ML/seme followed him and ended up sitting right next to MC/uke in class.