In Bangkok, Thailand, international thief Lung Shan is asked by gangster Skeleton Buddha to steal the dragon head. Unexpectedly, he collided with Xu Yi, an unemployed homeless man, and had an accident. They exchanged identities.

Before joining the imperial court a young Di Renjie was a minor judge in Bianzhou. When his mentor Yan Liben was welcoming Empress Wu back to the imperial court from the Ganye Temple, he encountered a strange ghostly incident called "Qingji". Master Yan was wrongly accused of being the murderer who intended to kill Empress and was jailed. To unravel the mystery, Dee comes to Chang'an alone, and with the help of his lover Gongsun Yu and his friend Yang Lu, a small-time gangster in Chang'an, he solves the "Qing Ji" murder case

Tired of rivalries and feuds in jianghu world, the great master Wolong Jianxian founded town of Dragon Gate. Deep in the desert. For people, who have washed their hands and ready to begin new life. Only a Dragon Gate Inn Inn welcomes guests from outside.