“King of Mahjong” revolves around a long-standing rivalry and eventual reconciliation between Wong Tin Ba and Ah Fatt. Two decades later, Wong Tin Ba, now a celebrated mahjong champion and influential figure, arrives in Ipoh to challenge Fatt to a decisive match at the World Mahjong Championship. Despite Wong’s persistence, Fatt refuses to participate, preferring the simplicity of an ordinary life. To coerce Fatt into competing, Wong kidnaps Fatt’s wife, Ramona, and pressures her to join his side. With his wife held captive, Fatt is compelled to enter the championship. As the final match unfolds, Fatt and Wong face off, revealing Master Ru’s legendary secret mahjong technique and uncovering the truth as the victor is declared.