In an elite high school swimming team plagued by a sinister curse, five teens unwittingly unleash a chain of deadly events after exposing a forbidden teacher-student affair through a leaked video. As the curse reawakens, they must confront betrayal and despair while racing to uncover the truth and break the cycle of death, only to realize they are destined to become each other’s undoing.

The same nightmare troubles Daniel every night: A vision of a young lady in red dress continuously appears. A timer counting-back from 49 mysteriously appears on his arm. People around him accidentally died one by one in brutal ways.