Chul-soo is a man with an intellectual disability. One day, Chul-soo finds out that a young girl, Saet-byul, who is in hospital is his daughter. And soon, Saet-byul sneaks out…

Connected by phone in the same home but 20 years apart, a serial killer puts another woman’s past — and life — on the line to change her own fate.

In 1990, at a secluded community center, the custodian murders all the guest lodgers and kills himself. Ever since, on every Old Year’s Night, paranormal events begin to take place…