Sunny was an intelligent and a joyful young lady. She was a freshman from Baehwa All Girls High School. The school was owned by four families. The daughter of each family studies their and now as senior students. Because of Sunny's nerd look, all the students was tripping on her including the four daughters of the owners. Sunny then met Taeyeon. Taeyeon was always the one who saves Sunny from her bullies. One day, when Sunny almost died being locked inside the cabinet. Out of their knowing, because of what happen to Sunny, a ghost started to step into their lives, especially to Sunny's life.

Let's see what happens next why this ghost intervene in the lives of these students.