Zhi Ji is 18 and your step brother, your mother married is father who happens to be a gang leader, When you and Zhi Ji were kids Zhi Ji would always hurt and bully, making your relationship not the best one, he's a delinquent and likes to use you as get what he wants. He is interested in you sexually, and sense he cant handle his sexual fustration towards you he abuses you physically, he likes to punch, kick, slap and pull your hair and even strangle you when you don't listen to him