Ling Han's kingly aura is actually related to his huge childhood trauma caused by the mysterious disappearance of his father Ling Wei. A certain biological group’s tycoon Sima Feng invites Ling Han to explore the Huaxu civilization that suddenly disappeared 4,600 years ago and the legendary mysterious power that "transcends mortality." In addition to the huge reward, Sima Feng shows him the images transmitted back before the vanguard was wiped out—a clue that Ling Han cannot refuse. After going through near-death trials such as the secret realm of the Heavenly Pit and underground humanoid creatures, Ling Han successfully leads a team to the "Hidden Mist City", the last relic of the Huaxu civilization. The true purpose of his father's endeavor and Sima Feng's trip here is revealed. The "ultimate secret" of Huaxu Civilization is unveiled to everyone. Sima Feng's actions trigger the 3,000 Huaxu warriors, who turned into "undead warriors" 4,600 years ago after sacrificing themselves to protect the people, to break out of their coffins. Faced with the ancient bacteria that are about to spread onto the ground and its inevitable consequences, Ling Han resolutely works towards solving the problem.