A college student, Yeoreum, carries the pain of her first love. One day, her first love, Suyeong, suddenly confesses to her. Suyeong even breaks off his engagement and passionately pursues her, shaking Yeoreum’s heart. After much consideration, Yeoreum decides to date him for just one year while giving him a hard time as revenge! But… Suyeong’s confession hides a secret.