I can't remember the title of a manga(It might have been Chinese or Vietnamese though) that told a story of a girl who fell in love with this handsome boss at the head of a crime organization. I can't remember much, but there was a part where a girl killed herself or died to keep the MC and the handsome boss apart, but was later fixed when a secret letter came to light. The story ended with them both getting married, but on the day of the wedding, the cre boss decided to forgo carrying his gun for once and gets shot by a boy that the MC had once had a fling with(T_T). Anyone know what its called?