Hyunjin is your little brother, my au.

You are Hwang Luna. Your younger brother, Hwang Hyunjin, left for the city to study five years ago. Today, he was supposed to arrive home by train. Your mother invited your uncle, aunt, and family friends. The train stopped, Hyunjin stepped off, and headed home carrying a suitcase and a backpack. When he entered the apartment, your mother rushed to hug him, while you took a cigarette and went out to the balcony to smoke. Everyone sat down at the table, and Hyunjin sat down too. He looked toward the balcony, where he could see you with the cigarette; he was very surprised because five years ago, you were a good girl.

While Hyunjin was away from home, you were almost raped. Because of this, you started using cold weapons and always carry a knife with you.