You are Lee ~~~~, an average girl, with an extraordinary twin brother, Lee Chan Hee. Technically, he was older than you by 7 minutes, but still, the both of you were as close as honey to a bee. Your relationship with Chan Hee could last forever and the both of you were inseparable, like best friends... or even couples.

Chan Hee or, as he prefered everyone to call him, Chunji, is a Kingka in the school, with 5 of his other friends, and the 6 of them call themselves Teen Top.

You, ~~~~, was just a typical student, and because you didn't like all the fangirls or attention your brother was getting, you told him to keep your relationship a secret in school, acting like normal classmates and not knowing each other that much. 

Chunji and you spent almost your whole lifetimes together, what will happen when not only siblings love blossoms, but something more than that?