I think it's this one http://www.mangago.me/read-manga/geu_kkeute_issneun_geos/?h7pb
Tho the scene you mentioned comes a lot later in the story
if it's not that one ^^, i think it could also be "Lookism"
ahh yes that’s the one, I was thinking it was that too but was too lazy to look back lol
I haven’t read lookism yet but I’ll probably read cuz it’s an interesting concept
thanks btw
I remember reading this manga/webtoon where the ML I think was living as another person. He had to throw away his own life and took the identity of someone else. It didn’t matter much because the guy who’s identity he took was really sick and was hooked up into wires. I think there was a scene where a guy said he had to look for the bathroom and then while he was walking he stopped and saw a door that was a buy opened and peaked through it but was interrupted by someone else saying not to look there I think. I think it was BL? I’m not sure.
I just thought if the manga all of a sudden because I was watching a kdrama where it had kinda the same plot lol