Louis Koo in 'Back To The Past' One Cool Group One Cool Group’s Back To The Past, starring Louis Koo and Raymond Lam, brought some much-needed cheer to the Hong Kong box office on New Year’s Eve, grossing a record-breaking $1.48m (HK$11.54m) on its opening day. The strong opening placed the film at number seven in the year-end chart of Hong Kong films, according to local industry body Hong Kong Box Office, just on the strength of a single day’s release (December 31). The film went on to gross $5.4m (HK$42.36m) over its opening weekend, which would have made it the biggest local film of 2025 if the Hong Kong Box Office chart included revenue from 2026.