Heaven, Hell, Crystal Palace.

Lung Wai Lan, the third princess of the Dragon King, incarnates as a human and falls in love with the bodyguard Lee Kim Wan at first sight. However, Lee falls in love with his cousin Yip So Sam and becomes privately engaged for life. Lung tricked Lee to marry her, but she misunderstood that Lee had abandoned her love and complained to the King of Hell. The matter was eventually found out by the Jade Emperor, who wanted to punish Lung and the Dragon King. Lung realizes her mistake and is willing to be punished, and Lee and Yip finally get married.