Ten years ago, the "Demon Burning Case" wiped out the Department of Antiquities. Shen Yanzhi took the bronze token left by his father and stepped into the demon-filled Yong'an City, just to find out the truth about the past and regain the mission of the Department of Antiquities of "protecting people and slaying monsters". In the coffin of the ruined temple, he unsealed the "green lantern", a town object refined from thousand-year-old green paulownia wood. From then on, he was accompanied by a dim blue light, killing wood demons and rescuing distressed souls, and gradually uncovered the secret of his father's death in battle - the white fox Su Daji who was rescued in the past turned out to be the leader of the Ten Thousand Demon Cave who cannibalizes the people.
There is a soul-eating conspiracy hidden under the eaves of the City God's Temple, innocent souls are locked in the black mist of the abandoned inn, and a demon wearing a ghost face threatens to massacre the city in three days. Shen Yanzhi holds the "Qingfeng Sword" and carries the "Green Lantern", working side by side with the old department of the Antiquities Department, struggling in the gap between humans and monsters: should he abide by the rule of "killing monsters when they see them", or should he leave a chance for the lost monsters to survive? When the flame of the green lantern illuminates Su Daji's tearful eyes, when the truth behind the ghost's face peels off layer by layer, in the night of Yong'an City, it is finally necessary to rely on this sword and this lamp to create a light to protect people.
