Once upon a time in China, two street inspectors named Gong and Ba were on the mysterious murder case in town – the massacre at a millionaire's estate, and the disappearance of the prestigious white-jade statue. But the renowned investigator Iron was assigned to the case, and quickly shoved the local Gong and Ba on the sideline, so they determined to track down the culprit on their own.

The duo chances upon two sisters-in-crime, Water and Fire, who disguise as bounty hunters to gain reward. Gong learnt from the sisters that the jade statue was delivered to Treasure Inn, the infamous trade market for loots nationwide. They decided to go to the inn to find the truth and join an adventure.