Overheard (traditional Chinese: 竊聽風雲; simplified Chinese: 窃听风云; pinyin: Qie Ting Feng Yun; Cantonese Yale: Sit Teng Fung Wan) is a 2009 Hong Kong crime thriller film written and directed by Alan Mak and Felix Chong, and produced by Henry Fong and Derek Yee. The film stars Lau Ching-Wan, Louis Koo and Daniel Wu as a trio of police officers conducting surveillance on a public company. The film was released theatrically in Hong Kong on 30 July 2009.
A major stock exchange in the world, Hong Kong attracts not only money but any who try to manipulate the market. At the Hong Kong Police Force Commercial Crime Bureau, an operation is underway to infiltrate a trading company, Feng Hua International where a man, nicknamed “Boss” is the chief suspect.
The team, led by Inspector Leung (Lau Ching Wan) together with Yeung (Louis Koo) and Lam (Daniel Wu) install interception devices to monitor the company’s communications. When a crucial information on a surging share was intercepted, a moment of greed led the team in a cross fire between the Bureau and the boss.