Nida is a single mother who takes care of her anti-social son who has locked himself in his room for five years. The only way to communicate with her son is to write on a piece of paper and slip it under the door. But, when outsiders start to get curious about what is going on behind the door of her son's room, a series of terrible events starts to happen.

Sinjai Plengpanich
as Nida

Kanya Rattanapetch
as Parn

Teerapong Liaorakwong
as Wirach

Khomapat Attaya
as Professor Sunee

Pongpitch Preechaborisuthikul
as Dome

Chatsoroth Thanuthipayakul
as Oat

Patipan Supsawatdichot
as Young Ton

Salina Rattana
as Young Parn

Parinda Pinitchana
as Anong

Thananop Bhalbulaya
as Natee