Question: Which 2012 Hong Kong police thriller film stars one of the "Four Heavenly Kings" of Hong Kong?

Context articles: Four Heavenly Kings
Hong Kong Police Band
Aaron Kwok
Hall of Four Heavenly Kings
Andy Lau
Cold War (film)
Forever Friends (film)
Show Luo discography
Four Heavenly Kings (Hong Kong)
History of Hong Kong Police

The Four Heavenly Kings are four Buddhist gods, each of whom watches over one cardinal direction of the world.
 In Chinese, they are known collectively as the "Fēng Tiáo Yǔ Shùn" () or "Sì Dà Tiānwáng" () in the ancient Sanskrit language they are called the "Chaturmaharaja" (चतुर्महाराज), or Caturmaharajikadeva: Four Great Heavenly Kings.
 The Hall of the Heavenly Kings is a standard component of Chinese Buddhist temples.
The Hong Kong Police Band (Abbreviation: HKPB; ) is a ceremonial unit and a military band of the Hong Kong Police Force and is used for official events.
 It was established in 1954 and initially performed with the Hong Kong Police Silver Band (formed in 1951).
 Both bands merged to form a single band and was later renamed the Royal Hong Kong Police Pipe Band.
 The Pipe Band colours is the MacIntosh tartan and was adopted in memory of a former Commissioner of Police, Mr Duncan William MacIntosh, after which the MacIntosh Forts were also named.
Aaron Kwok Fu-shing (born 26 October 1965) is a Hong Kong singer, dancer and actor.
 Active since the 1980s, Kwok is considered one of the "Four Heavenly Kings" of Hong Kong.
 Kwok's onstage dancing and displays is influenced by Michael Jackson.
 While most of his songs are in the dance-pop genre, he has experimented with rock and roll, ballad, rock, R&B, soul, electronica and traditional Chinese music.
The Hall of Four Heavenly Kings or Four Heavenly Kings Hall (), referred to as Hall of Heavenly Kings, is the first important hall inside shanmen (mount gate) in Chinese Pure Land Buddhist temples and Chan Buddhist temples and is named due to the Four Heavenly Kings statues enshrined in the hall.
Andy Lau Tak-wah, BBS, MH, JP (, born 27 September 1961) is a Hong Kong actor, singer, lyricist and film producer.
 He has been one of Hong Kong's most commercially successful film actors since the mid-1980s, performing in more than 160 films while maintaining a successful singing career at the same time.
 In the 1990s, Lau was branded by the media as one of the Four Heavenly Kings of Cantopop.
Cold War is a 2012 Hong Kong police thriller film directed by Sunny Luk and Longman Leung, starring Aaron Kwok and Tony Leung Ka-fai, and guest starring Andy Lau.
 The film was selected as the opening film at the 17th Busan International Film Festival and released in Hong Kong, Macau, and mainland China on 8 November 2012.
Forever Friends () is a 1996 Hong Kong released Taiwanese war-comedy film directed by Kevin Chu, starring Taiwan's popular "four little heavenly kings" (Nicky Wu, Takeshi Kaneshiro, Jimmy Lin and Alec Su).
 The original Taiwanese version of the film in Mandarin Chinese language was released in 1995 under the title "號角響起" (pinyin: Hao jiao xiang qi) which literally translate to "sounded horns".
 With the raising popularity of the "four little heavenly kings" in Hong Kong, the film was dubbed in Cantonese and renamed to a more comical title which literally translate to "four not normal youngsters" in order to cater more to the Hong Kong audiences.
This is the discography of Taiwanese Mandopop artist Show Luo ().
 From 1996 to 1998, he was part of a quartet boy band "Four Heavenly Kings" (四大天王), releasing five albums.
 Then in 1998, after two members left, he formed a duo "Romeo" (羅密歐), with Ou Han Sheng (); the other member of "Four Heavenly Kings", released two albums and was active till 2000.
 In 2003, he debuted as a solo artist with the release of "Show Time".
 He has since released eleven Mandarin studio, one Japanese studio, three compilation, one remix and three concert DVD albums.
Four Heavenly Kings (四大天王) is a Chinese term created in June 1992 by "Oriental Daily News" to refer to the four biggest male entertainment/arts superstars in Hong Kong at that time: Jacky Cheung, Andy Lau, Aaron Kwok and Leon Lai.
 Having successful singing (in both Cantopop and Mandopop) as well as acting careers well into the 2000s, they dominated the industry in Hong Kong and throughout the larger Chinese speaking world in the 1990s.
 Thus is the '90s is sometimes also called the "Four Heavenly Kings Era" in Hong Kong entertainment, as their songs swept the awards of Top 10 Songs of the Year during a 6-year span.
The history of the Hong Kong Police originates in 1841, when the Hong Kong Police Force (HKPF) was officially established by the British colonial government, the same year that the British had settled in Hong Kong.
 While changes have been implemented throughout the People's Republic of China (PRC) since the transfer of sovereignty in 1997, the Hong Kong Police Force (formerly the Royal Hong Kong Police Force) has since been responsible for serving the city.