The Young and Dangerous film series referred to the series of films produced by Hong Kong film companies that depicted the loyalty of the underworld, gang struggles, and violent crimes. They included many classic films such as Young and Dangerous, Young and Dangerous: The Young and Crazy, Young and Dangerous: The 13th Sister of Hongxing, Young and Dangerous: The Dragon and Tiger, and Young and Dangerous: The Successor of the Underworld. The leading actors of these films included Andy Liu, Stephen Zhou, Dawn, Jacky Zhang, Tony Liang, Zhang Jiahui, and many other stars. Their films had achieved great success at the box office and in terms of reputation. The series was loved by the majority of teenagers and Jianghu enthusiasts, and it became an important part of Hong Kong's film culture.