Sungyoung and Chanyeol was a good friend since they were in lower secondary school. The two made up to stay in contact which is going to the same school. It was a coincidence when they managed to get into the same class. The first day of school, she met her old friend, Joomi. The three of them came from the same previous school. After a while, a new transfered student entered the class, Hayi. Chanyeol then attracted to Hayi's appearance and they went out for a date. What happen to Sungyoung when she was the first to have Chanyeol but someone she just met already stole it from her?