Gallants (2010) on Netflix

Weedy office worker Cheung is sent to a remote village to secure property rights for his real estate company. Two martial artists run the village's teahouse, which was once the kung-fu school of their teacher Master Law. Law is in fact lying unconscious upstairs in a three decades-long coma, but he awakes when gym boss and local landlord Pong attempts to secure the teahouse for redevelopment. Law mistakes Cheung for a former student and starts training him in preparation for a martial-arts tournament at Pong's gym that will decide all their fates.