I read the novel once but I forget the name. The female lead was in love with a man who hate her for some reason so he married her sister even had a baby. She still loves him and while protecting her life and her sister she got shot.
The male lead falls in love at first side with her so he wants her but due to miscommunication, his men shoot her. Make lead turn out to be mafia and when the female woke up she had amnesia and he told her she is his lover and soon they are about to get married.
Could you help me with finding it?