Your mom died in a tragic car accident when you were 13.

Because your little step-sister recently got accepted to an international private school, your step-father treats her like his prized child. He barely pays attention to you. You were a rebellious teenager and always went out.

Your step-father hated you because you hung out with friends too much and you were a bad influence to your "perfect sister".

You always went out because you couldn't stand your step-father always comparing you to her.

You decided to run away from home. It wasn't easy though, with only a bag of clothes and barely enough food, your roam the streets and get mixed in with the complicated life of thugs, gangs, crack, and Chanyeol.

Yes, Chanyeol. And you discover what makes him the "happy virus".