Like... Imagine guilt tripping your boyfriend for trying to go along with your kinks while you cheat on him. Trash
Tarsoo was not trashy like shinwoo. He respected committed relationship and cut ties with that blonde sex friend when shinwoo came to him ....the thing is shinwoo played both taesoo and sebin
He knew Shinwoo was in a relationship with Sebin and still had sex with him various times, and also tried to manipulate Sebin into breaking up the relationship.
Yeah he was bad in regards to that but still he was way better than shinwoo. At least he tried to break take away shinwoo from sebin out of sincere feelings
Sebin deserves better, the other two were so fucking annoying and trashy