Chin-Sun got separated from her brother when they were young. Her mother left with her brother and stayed with her dad her whole life. Chin-Sun truly misses her brother, but barely remembers him. When one school evening her math teacher, Mrs. Kim, asked the new transfer student, Byeong-Cheol, to tutor Chin-Sun because she's failing her classes. Whenever she hangs out with him, she feels a weird vibe, but ignores it till' one day it changed her whole life. *I DON'T OWN ANY PICTURES*!