Andy Lau has been working on his new film, Lost and Lonely, in Quanzhou since mid-March.
He plays a farmer who begins a decade-long search for his son after a kidnapping.
According to an article in Hktopten, when he began filming, he was only spotted looking dirty to get into character.
Recent photos, however, show him looking thinner and darker than ever before, a shade of his former self.
Andy was said to be so convincing in his role, women who spotted him in Chongqing questioned if it was really the actor himself.
He wore a gray jacket and sported graying facial hair. He also kept to himself when seen with his film crew.
He has earned praise from fans for how convincing he looked and many have remarked that he should get the Best Actor accolade for his role.