Just another cliche story about a queenka and her kingka. Nam Eunhee is Woollim High's sweetheart, who is admired by all of her hoobaes and sunbaes, basically everyone on the campus. Not to forget, she is the younger sister of Infinite's grease ball, Nam Woohyun and the model Nam Woobin. Meanwhile, Kim Myungsoo or also known as L is Woollim High's ice prince basketball all star and the eldest son of the KMS Automobile. 

Years ago ever since, Myungsoo and Eunhee's mom were in college they had promised each other that when if they have children of the opposite , their children will be married to one another in order to tie the knot between the Kims and Nams.