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21-year-old Kim Soo Hyun abandoned his dreams and dropped out of school after a mysterious, dark incident ruined his family. To survive and pay off crushing debts, he became a rugged laborer, working alongside his unbreakable father in the coal mines. But when their shift is suddenly changed to the forbidden "Restricted Deep Zone"—a sealed abyss full of ancient secrets—everything changes. Unbeknownst to the world, supernatural forces are awakening, and a silent giant is about to claim his destin