Muay Thai Chaiya

In the small town of Chaiya, Piak, Pao, and Samor grow up as followers of Krang, a legendary Muay Thai fighter. Their father Tew trains them in Muay Chaiya and dreams of their future glory. The trio imagines a shared path to greatness through boxing.

An accident partially cripples Samor, forcing him to adapt. Piak and Pao begin training as boxers under their father, learning Muay Chaiya and cultivating their fierce spirits. The brothers' bond deepens as they prepare for a future in the ring.

Tew and Krang are recruited to a gym in Bangkok, and the local boxing school falls apart as a result. The move pulls Piak and Pao away from their hometown, dragging Samor and Sripai along. The capital becomes the stage for a new chapter in their lives.

Upon arriving in Bangkok, it is revealed that Tew has become a monk after Krangsuk's suicide, who took a fatal fall for being accused of throwing a fight. The shift unsettles the family, but they press on with new plans. The boys see the capital as both opportunity and danger.

Piak's skill with Muay Chaiya makes him a fierce fighter, but his hotheadedness also makes him a liability in the ring. A critical fight costs him his traditional boxing career, pushing him toward darker paths. The loss drives him toward the underworld as a source of power.

Piak and Samor slip into the underground world, taking on bare-knuckle brawling and shadowy jobs for a crime boss. They also work at a go-go bar where Warn dances and uses her allure to draw Piak into trouble. The underworld tightens its grip as loyalties are tested.

Sripai discovers Piak in bed with Warn and confronts him; she leaves to find Pao. Pao and Sripai begin living together, complicating family ties. Piak takes over the underground business after the old boss is killed by a rival.

Piak's leadership grows as he inherits the underground operation after the boss's death, navigating criminal networks and keeping Samor’s loyalty close. The shadows of Bangkok's underworld become the arena where their fates are decided. Piak's control tightens as threats mount.

Pao trains with his father and rises toward becoming a top boxer. He faces a brutal farang, Diamond Sullivan, who uses performance-enhancing drugs. Pao loses the first fight, setting up a tense clash of loyalties and ambitions.

Piak and Samor are ordered to kill Pao, but Piak shoots Pao non-fatally instead. He is arrested, and Pao is pulled deeper into the gang's schemes. The brothers' estrangement widens as law enforcement closes in.

A rematch is planned, with gang pressure on Pao to throw the fight. Samor sends Pao a tape urging him to give it his all. During the transfer, Piak is freed with Samor's help, setting up a last chance to protect Pao.

Samor sacrifices himself by triggering an explosive vest in a car, killing several gangsters and buying time for Pao. Piak and Pao press on toward the stadium, trying to outrun the hit squad. The act starkly tests their loyalty and courage.

Piak arrives at Rajadamnern Stadium as Pao's rematch with Diamond unfolds, helping to blunt the gangsters’ assault. Pao endures brutal punishment but channels the brothers' training to land a decisive finish. The stadium becomes the crucible where their past and future collide.

After Pao's victory, the mob orders more killings. Piak confronts the crime boss and, when threatened, shoots him with a policeman's gun; police close in and Piak is fatally shot. His sacrifice seals Pao's triumph but costs Piak his life.

Pao, Sripai, and her daughter return to Chaiya. Pao scatters Piak's ashes into the ocean, honoring his brother's memory as the family begins anew. The circle closes with a quiet transmission of guardian spirit and family ties.