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The film opens in 1978, where Professor Yang inaugurates Post 749—a team focused on unearthing secrets linked to the mountain’s anomalies. By 1979, soldier Hu Bayi is introduced as a weary but dedicated member of the excavation team, often feeling fatigued from the demanding work. A budding romance blossoms between Hu and Yang Ping, the professor’s daughter, which complicates the dynamics with Hu's friend, Cang Sun.
After discovering a gigantic skull, the excavation site is rocked by an explosion, leading the team deeper into the mountain. The chance discovery of a cave sets them on a path fraught with danger, razor-sharp suspense, and unexpected revelations about an ancient kingdom.