Duel of Fists

Fan Ko is summoned to his dying father's bedside, where the man confesses an old affair and hints at a son in Thailand. He shows an old photo and asks Fan Ko to find the young man. The task hints at a dangerous family link that will drive the journey.

Fan Ko boards a Cathay Pacific flight bound for Bangkok after the revelation. He leaves his suit-and-tie life behind for a more rugged mission. The search for a brother begins in a foreign city.

Upon arrival, the city is in Songkran revelry as water fights erupt in the streets. Fan Ko checks into the Dusit Thani Hotel. He adopts colorful attire, shedding his corporate disguise.

Fan Ko sneaks around Lumpini Stadium and spots a fighter named Miller; a large plywood cutout and tattoo hint at a link to his supposed brother. He asks an old fighter-turned-alcoholic for the name, who cryptically calls the next rival 'dead man'. The atmosphere is tense as spectators drift toward the next brutal match.

Miller faces Cannon and is overwhelmed; Fan Ko tries to intervene but cannot stop the brutal outcome. Miller is killed in the ring, and Fan Ko confirms the tattoo matches but the bird is a swallow, not an eagle. The supposed brother remains elusive.

Fan Ko befriends Mei-dai, a Thai woman who guides him through Bangkok's sights, including the Grand Palace. Their companionship broadens Fan Ko's understanding of the city. The search continues beyond the stadium's ring.

Through his investigations, Fan Ko meets Wenlie but has not yet seen Wenlie's tattooed left arm. The pieces of the mystery begin to align as martial skill and loyalty emerge. The possibility of a familial bond fuels his urgency.

Wenlie enters the ring against Cannon and endures a savage beating before rallying to win. Fan Ko realizes the tattoo on Wenlie's arm matches the father's clues. Overcome with relief, he tells Wenlie that they are brothers.

Miller's brother Misao assassins Cannon after the bout, drawing the wrath of the villains. They storm Wenlie's place and kidnap Misao, escalating the danger for Fan Ko and Wenlie. The brothers vow to rescue him.

The brothers are ambushed by henchmen as they search for Misao; they fight back with skill and fury, knocking the goons aside. The villain's men reveal the plan and confirm Misao's kidnapping. The brothers decide to go to Misao's location to rescue him.

At the house where Misao is held, Misao is beaten and killed in front of the brothers. They confront a large gang of weapon-wielding henchmen and press the attackers back. Fan Ko fights the henchmen while Wenlie squares off with Qiang-ren, inching toward justice.

Fan Ko defeats Qiang-ren by breaking his leg during the final encounter. The police arrive as the villain falls, and the criminals are arrested. The brothers survive the chaos, their bond sealed by blood and battle.