Ho Sau, an undercover agent, has been working with Yau, a drug lord, for years, but his job and family are in trouble.
After dropping out of her university's dance crew, a working-class student finds inspiration in tai chi for her own unique style of street dancing.
Hong Kong Customs and Excise Department officers Chow Ching-lai and Cheung Wan-nam share a close mentor-student relationship. On a case involving seized smuggled arms, Ching-lai is sent to take part in a joint operation with Interpol to capture a reclusive arms dealer. However, Wan-nam makes a drastic decision that further complicates the case.
