Responses
https://www.mangago.zone/read-manga/when_the_killer_falls_in_love/
or maybe killer crush?
Sadly its not it. The seme is a gangster/debtor not an assassin
Maybe this?
https://www.mangago.zone/read-manga/did_it_work/
Its a bl, uke lied saying he loves the seme to save his ass from death. Seme never been loved before,that's why he is so moved by uke's confession they immediately date. Seme is a gangster