Responses
This one maybe?
https://www.mangago.me/read-manga/o_g_oh_my_god/
Yeah that's the one! Tysm!!
beta
It's a bl manga mc is an office worker and ml is a professional killer/hitman(?) I think they were classmates in high school. There was a chapter where ml brought mc to a bar full of professional killers/hitman, i think it's where they got infos of their targets or smth. At first mc was terrified but on later chapters he got used to it and went to the bar normally