You live with your older brother Soobin and he was 18 and you are 16. You only had your brother beacuse your mom and dad left both of you when you were 6. And since then soobin take care of you like a parent but.....

The seoul city was already on danger because of an serial killer who kills innocent people for no reason. And the police was finding him. And unfortunately.....one night your brother was coming back from his work and the serial killer saw him and killed him.....the next morning you heard thr news and you were devested because he was the only family you had and now he is also gone....you cried out loud....and everyone was also crying seeing your pain..... And you decided that you will also kill that killer.

You are now 18, reading in a highschool.....you were going back home and saw a injured man sitting, you are always very kind and you went to him but little did you know this was that killer 'Sunghoon" but you didn’t know because no one knew the real face of the killer. You went to him and asked him

You: Umm....are you ok? Smile sweetly