I'm looking for a romance/smut manga I read a long time ago. It's not anything special but it's annoying me that I can't find it anymore. I can't remember much except for the ending so obviously, there will be spoilers. Basically, the lady finds and helps the male lead as he was injured. He was either a businessman or mafia can't really remember, but he ends up obsessing over her to the point where she isn't allowed to leave. Leading to her running away for a while and meeting male lead 2 (He's not very important but he comes up at the end of the story.) Male lead 1 obviously finds her and drags her back and the story continues. It ends with her finally accepting him and agreeing to marry him but...

Male lead 2 shows up at the church and kills male lead 1. It ends with her revisiting his grave(I think) with her living with male lead 2 but obviously still not over #1, and his ghost can be seen watching over her.