Louis Koo Tin-lok is a Hong Kong actor, singer and film producer. He began his professional career as an actor in local television series, winning TVB's Best Actor award in 1999 and 2001. After 2001, he fully focused on film career and became one of the stalwarts of the Hong Kong film industry. In 2018, Koo was awarded the Hong Kong Film Award for Best Actor, Asian Film Award for Best Actor and the Hong Kong Film Directors' Guild Award for Best Actor for his performance in the 2017 film Paradox.

Bullets Over Summer is a 1999 Hong Kong buddy cop action film directed by Wilson Yip and starring Francis Ng and Louis Koo. For their performances in the film, Ng and Law Lan were awarded Best Actor and Best Actress respectively at the 6th Hong Kong Film Critics Society Awards while Law was also awarded Best Actress at the 19th Hong Kong Film Awards and Best Supporting Actress at the 5th Golden Bauhinia Awards.