Vengeance of an Assassin

Thee (Dan Chupong) and his brother Than (Nantawooti Boonrapsap) are two young men being raised by their uncle (Ping Lumprapleng) who runs a car repair shop. They are curious about a room their uncle always keeps closed and will not let them enter so one evening they get him drunk and sneak into the room, where they find evidence that their parents also used to be undercover detectives and were killed in an ambush by an unknown attacker. Their uncle, who was also a detective at the time, promised their parents that he would take the brothers raise them as normal children and protect them from their parents' and his old life and profession as detectives. After learning this Thee resolves to set out to find out who killed their parents while Than remains to work in their uncle's car repair shop, training himself in martial arts by watching VHS cassettes in the back of the shop.