A high school teacher named Seo-Rin encounters a mysterious person called Master through instant messaging. This figure reminds her of the past that she has always wanted to forget. As her students, boyfriend and acquaintances get involved in this incident, the situation grows more and more serious. Seo-Rin tries her best to overcome what she is going through.
|Cast:||Go Gyu-pil, Jang Hyuk-Jin, Kim Da-mi, Kim Hee-won, Kim Yeong-seon, Lee Hak-joo, Lee Je-yeon, Lee Yoo-young, Oh Ha-nee, Son Kang-gook|