helpp

I was reading this manga but I forgot the title :(( here's the summary: mc sister is getting married to this guy, he has like red hair i think, mc spends time with him and Red hair lied and said they slept together. turns out red hair is a con artist and scammed mcs sister. mc goes to club to find him, nearly gets sexually assaulted or something but red hair comes to save him?? i think mc had black hair and short hair? like buzz cut? its a bl and in black and white :) would appreciate if someone found this :) thankss