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Struggling to pay his comatose mother’s hospital bills, college student Yoon accepts an offer to ride a mysterious “prototype train” for 600 million KRW. He boards without hesitation, joining others who seem to be there for the same reason. But the ride quickly turns unsettling. Why such a high reward for a simple task? And why does the train feel anything but normal?

This series is rated Teen. Please review the Content Ratings page for more information.