Zeng Jian was a Hong Kong drug trafficking boss. After being chased by Xiao Hong and the police force led by Ida, he fled to Thailand, leaving his mistress Carry in Hong Kong. A few years later, Zeng Jian returned to Hong Kong as a Thai overseas Chinese, Sha Hua, and Carry had married Superintendent Jin Zhiyuan. Zeng was very angry when he learned that, so he set up a gambling game to deceive Zhiyuan, making Zhiyuan owe a huge debt and forced him to work for Zeng. At the same time, Ida went out to investigate Zeng Jian, which blocked Zeng's transaction and planned to kill Zhiyuan and frame Ida.
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