Tiang (Tony Jaa) is the son of a nobleman named Lord Sihadecho who is brutally killed in ancient Thailand. The much resistant young Tiang aspires to be like his dad when he grows up. Tiang manages to escape close death when he is rescued by a warrior named Cher Nung (Sorapong Chatree). Intrigue by the young Tiang, Chernang decides to take the brave young Tiang under his wings upon seeing his physical potential. Tiang intensify his training skills and abilities under the watchful eye of Chernang who now regards him as his son. He grows up wanting to avenge his father's murderer whom Tiang believes is Rajasena Lord (Sarunyu Wongkrachang). However, his attempt to kill the powerful Lord has failed when a battalion of his loyal army protects him. A shocking twist of event occurs when Tiang learns the truth about his father's real murderer.