King of Mahjong centres on the decade-long feud and eventual reunion of Wong Tin Ba and Ah Fatt. 20 years later, Wong Tin Ba, who is now a world-acclaimed mahjong champion and magnate, shows up in Ipoh to challenge Fatt to a final showdown – The World Mahjong Championship. Despite Wong’s insistence, Fatt declines to join the competition as he is determined and contented to lead the life of a commoner. In a bid to force Fatt into the showdown, Wong abducts Fatt’s wife, Ramona, and threatens her to be on his alliance. Fatt has no choice but to join the championship as Wong holds his wife hostage. On the mahjong table, Fatt and Wong compete as the finalists; Master Ru’s secret legendary mahjong move and the truth comes to light as the winner emerges...

Le Ren who moves into an old house located at suburbs with his girlfriend, Ming Ming. They think their new home would bring them serenity and they could start a happy life in there. However, Le Ren is not aware that this house would one day becomes his nightmare. Soon after they move into the house, Le Ren hears some low, muffled sounds from nowhere in the house.