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Li Bing, who has just been promoted from PC patrol police to CID, has just been promoted from PC patrol police to CID. In order to enrich himself, in addition to participating in various trainings in the police force, he also privately went to the martial arts hall in the evening to follow Taiji master Wu Hui to learn Tai Chi, so he met his brother Xiao Qi. Xiao Qi was friendly and enthusiastic, and even instructed Li Bing from time to time to practice with him. The two gradually became good friends and talked about everything.