Donnie Yen plays drug lord from '70s Hong Kong

In his career spanning three decades, actor Donnie Yen has starred as many heroes, such as a martial arts master in the Ip Man franchise and as a blind monk in Rogue One: A Star Wars Story.

So, it may be not a surprise that he was at first unsure about joining Chasing the Dragon, a new crime action movie based on the true story of Ng Ski-ho (1930-91), an infamous drug lord in Hong Kong in the 1960s and '70s.

The movie will be released on Sept 30.