After accidentally causing the death of his partner during a hostage situation, Wu Young-min quits the police force to work for his uncle as head security of Dreampia, an immense shopping center. Dreampia is currently in the rebuilding stages as a fire destroyed parts of it five years ago. The re-opening was scheduled in a few days, until some strange murders begin to occur in the building. It seems that the victims, all employees of the mall, have committed suicide in very gruesome and unconventional ways. Young-min is very suspicious about the police explanation, and starts his own investigation, but unfortunately for him, an old acquaintance, Ha Hyun-su, is in charge of the police investigation. Hyun-su still blames Young-min for the death of their friend and is not interested in cooperation. The more clues they stumble on, the more strange and unnatural the truth becomes.
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