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Lee Shi Woo, the heir to Seojin Group, is sent to prison for protection—but instead finds himself targeted, as if marked for death by his own family. When a mysterious inmate, Nam Jiho—known by the number 666—saves him, Shi Woo decides to stay close for survival. But the deeper he gets, the clearer it becomes: Jiho might be the most dangerous threat of all.

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