This is a story of a normal high school girl, who wish to graduate in an elite high school in Seoul for her so called "bright-future". She had this not-so-little "admiration" on a girl named Sana. Dahyun is currently called as the most "lucky person in the world" for being the roommate of the Goddess Chou Tzuyu and a small cub-like person named Son Chaeyoung.

But if one day, her life suddenly change because of a mistake?

A mistake she wants to burry, deep within her soul.

A mistake she wants to forget.

A mistake she never want to recall again...

And a mistake where she will meet her.