Alone. 

Yes, that's the key word. The most awful thing in the English tongue.

Murder doesn't hold a candle to it and hell is only a poor synonym. 

Jeon Wonwoo's friends acknowledge him as the guy who always smile no matter what, and also the guy who is energetic and talkative. 

No one knows that it's a fake act Wonwoo put everyday to hide his pain. 

They don't know about how he always feel miserable about his life since his parents divorced. 

They don't know about how he always feel insecure about himself, and how he hates to be born as Jeon Wonwoo. 

They don't know, about the fact that Wonwoo never felt happy about his life ever since his parents divorced. 

No one knows and no one try to find out because all of them thought that Wonwoo is really okay. 

No one, until one person named Kim Mingyu appear in Wonwoo's life.