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Keizoku is a Japanese mystery thriller created first as a TV drama and later as a film. It is about Detective Jun Shibata, who handles unsolved cases with her hardened partner Tōru Mayama. The television series was broadcast in eleven episodes between 8 January and 19 March 1999. A two-hour "special drama" was then broadcast on 24 December 1999. The series has been called "epoch-making" in the police procedural genre on Japanese television.

Pi Zi and Ying Xiong are two cops who are as different as day and night. One lives a luxurious lifestyle and does nothing but drink coffee and wait for information from dubious sources to crack his cases. Another believes law and justice are the pillars of society and is constantly on the street catching criminals. When a case brings these two top crime solvers together, sparks fly and light begins to creep into the dark corners of Taipei.