The Legend of Thai Fighter(2012)

Kla and Yod are two Muay Thai fighters during the Ayutthaya period. Yod has been conscripted to an outpost and is attacked by a mountain tribe and reported killed in action. Kla is devastated by the news and finds solace with Yod's wife, Saengchan. But Yod didn't die and when he returns home he finds his best friend together with his wife.