Liu Jun, a thousand-year-old snake immortal, descends the mountain on his master’s order to guard Luo Qinghan, his benefactor from a past life, and investigate the annihilation of the Wen clan. He stays by Luo Qinghan’s side as her bodyguard, foils the Gu clan’s schemes, heals the head of the Shen family, and retrieves his junior sister and the surviving orphan. Finally, he joins forces with the Shen family to bring the Gu clan to justice, clears the Wen family’s name, and finds true love with Luo Qinghan.
