The film begins in 1431 feudal Siam. It is a time of political upheaval, treachery and danger. The opening scene explains how during the reign of Borommarachathirat II of the Ayutthaya Kingdom, the Ayutthaya royal court became more powerful than the Sukhothai kingdom and expanded to the east. The Ayutthaya army besieged the cambodia for several months. The king sent his son, Prince Indraracha to rule the kingdom.
In the year 1431 in Thailand, Tien (Tony Jaa) is held captive being beaten with wooden stick fighting. On the orders of Lord Rajasena (Sarunyu Wongkrajang), his elbows and knees are snapped. As Lord Rajasena sleeps, Tien's guerilla fighters attempt to free Tien, but Bhuti Sangkha (Dan Chupong) appears and kills them. Lord Rajasena offers to hire Bhuti, but he refuses and gives the offer to remove the curse which has been placed on Rajasena before leaving. Rajasena orders his men to kill Tien, but before this can be carried out, a man arrives with a pardon from the king, indicating that he will take Tien, much to Rajasena's ire. The messenger returns Tien to the Kana Khone villagers. After fending off the village from invaders who are after Tien, Master Bua (Nirut Sirijanya) feels guilty over Tien's imprisonment and becomes a bhikkhu. Pim (Primrata Det-Udom) heals Tien to life, but finds that Tien is still crippled from his beatings. Tien then embarks on a rehabilitation regimen with the help of Master Bua.
