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...
| Actor | Role |
|---|---|
 Chapman To Man-ChatPak Chong Fatt | Pak Chong Fatt |
 Mark LeeWong Tin Ba | Wong Tin Ba |
 Michelle Ye XuanRamona | Ramona |
 Venus Wong Man-YikSassy Bai | Sassy Bai |
| AAdrian TanWayne Yang | Wayne Yang |
 Cheronna NgZhang Dee Yi | Zhang Dee Yi |
 Richard LowTiger | Tiger |
 Patricia MokNancy | Nancy |
 Dennis ChewAh Lian | Ah Lian |
 Eric Tsang Chi-WaiMaster Ru | Master Ru |
 Lo Hoi-PangNot listed | Not listed |
 Susan Shaw Yam-YamMahjong Player | Mahjong Player |
 Mimi Chu Mai-MaiMahjong Player | Mahjong Player |
 Kingdom Yuen King-TanMahjong Player | Mahjong Player |
 Hayley WooChinese Mahjong Master | Chinese Mahjong Master |
 Jayley WooChinese Mahjong Master | Chinese Mahjong Master |
| LLenna LimIcy | Icy |
| TTommy KuanMushroom | Mushroom |
| GGadrick ChinSea Cucumber | Sea Cucumber |
| TTay Yin YinWong Tin Ba's Maid | Wong Tin Ba's Maid |
 Marcus ChinNot listed | Not listed |
 Tien HsinNot listed | Not listed |
| 张张文盈Couple | Couple |
| 孙孙文海Not listed | Not listed |
| 陈陈智深Back alley kid | Back alley kid |
| 黄黄敏瑜Back alley kid | Back alley kid |
| 王王钲凯Ipad kid | Ipad kid |
| 伍伍彩祯Not listed | Not listed |
| 徐徐银海Not listed | Not listed |
| 李李松亮Not listed | Not listed |