The film is structured into three episodes: "Goblin Frequency," "Electric Brain," and "Life Water." The protagonists of each episode face harrowing experiences: a fisherman loses his life to the pond's ominous aura, a Bitcoin miner loses his mother by following computer instructions, and a person experiences bizarre physical changes after drinking the pond water.
Hochul and Youngran, the owners of two cafes, fall in love with each other and plan to live together. However, they must wait for the time being because of the remaining real estate contracts. One day, they have a small car accident. In order to keep it quiet, they decide to take care of the young man involved, named Suk about whom they know nothing.
While under heavily armed guard, the dangerous convicts aboard a cargo ship unite in a coordinated escape attempt that soon escalates into a bloody, all-out riot. But as the fugitives continue their brutal campaign of terror, they soon discover that not even the most vicious among them is safe from the horror they unknowingly unleashed from the darkness below deck.