Snow and Hai were the foster daughters of the Sixth Knight. Hai was a professional in using fire. She was also known as "Devil of Fire".

One day, the Sixth Knight sent Hai to kill Yuen in order to get the letter from him. Yuen noticed that he was in danger, so that he had passed the letter to his brother, Ming. After killing Yuen, Hai followed Ming to a circus. However, Hai was defeated by Ming and Jan, the famous inspector.

After that, Hai pretented to be a routier to find the letter. Days pass by, Jan and Hai fell in love. However, the Sixth Knight still actuated her to complete his jobs. At the same time, Snow started to hate Hai...