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Liu Xi, who was adopted by a monk at a young age, is played by Wu Jing. He follows his adoptive father, Jixiang (played by Hong Jinbao), to escort the "Gongfo Tianzhu." However, the Tianzhu is stolen by a group of mysterious people during the journey. Jixiang suspects that the incident is related to the "Double Door" organization that disappeared years ago. He then seeks out the former principal, Chang Zhong (played by Yuan Hua). To quickly find the lost Tianzhu, Jixiang and Chang Zhong decide to reassemble the "Double Door" organization. They retrieve the twin sisters Pearl (played by Charlene Choi) and Baozhu (played by Gigi Leung) from a circus, along with the other students. After a long search, they finally discover the whereabouts of the Tianzhu and engage in a fierce battle with a group of people who seem to be part of the "Double Door." In the end, Liu Xi manages to retrieve the "Tianzhu," but mistakenly hands it over to Chang Zhong's younger brother, Chang Yong. He also uncovers more secrets.