Eunha is music school pianist and one of the best students.  Her parents are businessmens of a big Korean corporation.They never wanted to have a child, that's why they don't care about Eunbi and ignore her.   One day her friend decide to organize a birthday party at the club. 

Sowon went to a Halloween party because she wanted to see Eunha. She was disappointed when girl wasn't there and decided to go home.   Eunha was always afraid of scary things but this Halloween she wanted to try overcome her fear while watching the horror movies marathon.  What can happen if she stay alone at home?