You and Soobin have an arranged marriage because you both come from rich families and it will be more convenient for your parents. You both got married and have been living together for 3 months now. one day you come home and see a girl, about 12 years old, sitting on the couch and talking to Soobin, it was his sister Solyun. You go into the living room and greet them, it turns out that Solyun will now live with you.