Qinglan Sect gatekeeper old man Pei Wujiu, seemingly slovenly and lazy, is actually the Prime Chaos Dao Ancestor who has lived in seclusion for three thousand years. The Nine Heavens Immortal Emperor suddenly appears, kneeling in public to shout Master, and his true identity thereby shakes the immortal cultivation world. Pei Wujiu takes odd-job disciple Jiang Xiaoyu as his apprentice, yet is also embroiled in the Heavenly Dao conspiracy. As the underground palace seal shatters, old cases are reopened, and ten thousand sects besiege them, everyone gradually uncovers the truth of the Cangxuan Divine Envoy manipulating all living beings. In the end, Pei Wujiu unites with Jiang Xiaoyu and others to break the shackles of the Heavenly Dao, returning freedom to all living beings, while he himself returns to the Qinglan Sect mountain gate, continuing to guard the gate and sell roasted sweet potatoes.