It takes place in six hours on a passenger boat with an ongoing black market organ-trafficking operation, and a desperate husband out to find his missing wife.

[1][2][3] After his best friend dies in an unexpected accident, the black market dealer Young-gyu decides to wash his hands of his illegal activities and start a new life.

The broker promises to help her secure a legal organ donation but secretly relies on black market dealers like Young-gyu, who engage in multiple kidnappings and killings.

of operating out of a ferry boat that runs between Korea and China, picking victims from among its passengers, abducting them from their rooms, harvesting their organs on board the ship while they are still alive yet restrained, and then brutally disposing of the bodies afterwards.

That very evening, just when the boat enters international waters where countries' laws cannot be enforced, Chae-hee suddenly goes missing, and all her pictures and belongings vanish without a trace.