Han Dong-ji, a second-year middle school student, is being ostracized in his class. One day, the class is assigned a group project where each member must film a self-introduction video at their own home, but no one wants to be in a group with Dong-ji. Jin-a, the class president, deliberately takes Dong-ji into her group to get a high score on her performance evaluation. Dong-ji sees an expensive camera at Jin-a's house and steals it, and So-yeon, a groupmate, suspects Dong-ji. However, Jin-a herself doesn't seem to care much about the camera being stolen, which makes Dong-ji feel even more burdened. As the day approaches when Jin-a will visit Dong-ji's home, Dong-ji's anxiety grows.