No, My Adopted Sister Is a Gangster Daughter, Who Knows?

(Single female protagonist + no system + no cuckold) What is it like when the wealthy family that adopted me turned out to be a mafia family? What should I do if the daughter of the underworld has been plotting evil against me since childhood? As the sole heir of a mafia family, what should you do if you are accidentally cheated by the daughter of another mafia family? … My name is Jiang Chen. I ran away from home since I was a child and was adopted by the Lin family as a younger brother to a girl. My job since childhood has been to keep her safe while playing the role of her sweet little brother. I thought I could live a normal happy life from now on, but in reality this bitch slapped me hard...