Falling for Danger

Read Manhwa Falling for Danger / The Chain Smoking Hitman / The Chain-Smoking Hitman / 헤비 스모킹 스파이

I could kill you if I wanted.

Hayden Windsor was a renowned hitman until he is betrayed and loses the love of his life.

With nothing left to live for, he begins a war of revenge on the very organization he used to work for.

That is, until he meets Marine, a girl who brings color back into his black and white existence.