In a magical world of inter-clan rivalry, two soulmates face treacherous schemes and uncover a dark mystery linked to a tragic event in the past.

In the reign of Emperor Taizong (627—649), which was called the Prosperity of Zhenguan, former clothing maker An is framed and imprisoned. When she was in danger, she entrusts her young daughter Liu Li to an old friend in the palace. Liu Li grows up in the palace and becomes a medical officer, responsible for epidemic prevention.

Near Qishan Mountain, there is a little town called Fu Feng, which is nicknamed the "City That Never Turns Dark". There, lies a legend of the "Lit Lamp Murderer". Wen Ning arrives at Fu Feng, and he realizes the abnormality of the town; the whole town is filled only with the weak and sick; and is very run down. When the night arrives, Wen Ning purposefully lit up a lamp to attract ghost shadows. Just as he was about to capture them, a ray of blue sword light appears and the black shadow disappears. Wen Ning looks up, and sees his nephew, Lan Sizhui. Wen Ning and Lan Sizhui decides to work together and solve the mystery and capture the culprit behind the mysterious incidents.

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