Fei Wu (吴飞/吳飛) (Wu Fei in Chinese Order) is a teenage girl living in Shanghai, China. She was found by Wu Shifu as a baby on the doorstep of his Martial Arts School and raised by him as his adopted daughter.

Wu Shifu trained her in the martial arts and raised her to uphold the values and one day take over as guardian of the Sacred Cave. After Wu Shifu died and his school was destroyed, Fei became a thief to amass enough money to pay off a local crime boss, Cash, 