Sally Kim is EXO's make-up artist since their debut. She has a one-sided crush on one of the member, Lay, who is dating with Jang Nara, a member of a popular girl group called Pink Trouble. But suddenly, they broke up. With some helps from Kris, the only EXO member who is close to her, she tried to put Lay's smile back and heal the scars in his heart.