Former policeman Woo Young-Min (Yoo Ji-Tae) is emotionally crippled by the memory of a botched hostage situation that resulted in the end of his career and the death of his partner. Withdrawn and filled with self-loathing, he now works as a security guard in a department store that is set to reopen after a fire. After a spate of gruesome and suspicious suicides in the store, Young-Min is obliged to investigate out of a sense of duty to his uncle, the store’s chairman.