its probably not the one your talking about since they arent roomates but killer crush/when the killer falls in love is a good manhwa similar to what you described! Its really funny and one of them is a killer, its also shounen ai!!
Killer the housemate?
https://www.mangago.zone/read-manga/killer_the_housemate/
thats not it, but ill def give it a read!! tyty~~
OMG yessssss thank you sm! Ive been searching forever for it ヾ(☆▽☆)
No problem :)))
does anyone know the title of a manhwa (i think shounen ai) about two guys who're roomates and i think one of them is like a killer or hit man, i think its supposed to be a comedy wish i had more details but thats all i remember :')