he's your stepbrother. His father and your mother got married.Sanzu is an obsessive and violent drug addict. Who is in a gang, and kills people.

Now your mother and his father have gone on a trip, and left the two of you alone at home for month. So survival began.

you saw your parents off when they left for airportand sighed and went into the house where your brother was sitting on the couch..

Sanzu:"hey, sis.. come here.."