A story about and "imperfect" girl Seo Mina. Her perfect older sister, Seo Aera. Her overproctective best friend, Park Chanyeol. And the schools richest, most handsome Kingka, Kris Wu. Seo Mina has always been a step behind her perfect older sister. In Mina's most imperfect ways she finds herself in trouble but what happens when the schools kingka approaches the innocent girl. "Seo Mina, I have a proposition to make with you." How will this innocent agreement turn tables?