"Of course I recognized you. You're my first love." Living a life of being stalked by her first love, Dam Do is visited by her brother's friend Yun Oh. No longer the boy next door who used to follow her around like a puppy, Yun is now a man, and he acts strangely aloof around her. While Dam has found herself resenting her first love, Yun is secretly quite excited to be around his first love once again. As the two become reacquainted after their time apart, they may be in for a lesson on what love really is.