Choi Yeo-Reum (Jang Gyu-Ri) is a 19 year old high school student. On a summer day, she learns that her birth was a burden to her parents. She feels miserable and wants to die. On the day that she decides to take her own life, she meets her neighbors Na A-Reum (Yoo Young-Jae), Na Da-Woon (Son Sang-Yeon) and Na Woo-Ri (Kim Min-Ki). They are triplets.