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Resources share the relationship resource.screenwriter to Yu, Xi
- Du zhan, Drug war, Beijing Hairun Pictures Co., Ltd., Huaxia Film Distribution Co., Ltd., CCTV 6 Movie Channel present ; screenplay by Wai Ka Fai, Yau Nai Hoi, Ryker Chan, Yu Xi ; produced by Johnnie To, Wai Ka Fai ; directed by Johnnie To