Young Dee Renjie arrives in the empire's capital to join the Supreme Court as police judge of his region. He wants to become a prosecutor. Empress Wu, who is at the beginning of her reign, has commissioned the fierce detective Yuchi to investigate a sea monster that stalks the city at night and makes it unsafe.

After the death of her father, a woman is forced to take over as empress and fight to save her kingdom.

An evil force has trapped the villagers of Qing Ya and spirited them away to a realm in the clouds. There, guarded by fierce dragon-like creatures, they must toil endlessly to satisfy the whims of the cloud-dwelling gods.