Moss Shaw, a mortal, encounters Yun Dian, the third prince of the Eastern Azure Sea, imprisoned. Moss Shaw risks his life to retrieve dragon tongue grass to break the restriction on Yun Dian. Yun Dian uses his dragon blood power to cure Moss Shaw's blind daughter. When evil spirits plague Twin Rivers Town, Moss Shaw and Yun Dian join forces to eliminate the evil. Every Mid-Autumn Festival, Yun Dian meets Moss Shaw and his daughter.