On March 19, 2005, Kaoklai entered the Korean World GP as a defending champion. He beat Qing Jun Zhang in quarterfinals and Hiraku Hori in semis, before facing a 7'2" and 346 lb (2.18 m, 157 kg) former Korean Ssireum wrestling champion, Hong-Man Choi in finals. Choi more than doubled Kaoklai's weight and towering a 1'3" (0.38 m) above the defending champion. Kaoklai was unable to overcome the disadvantage this time and lost the fight by unanimous decision after an extra round. After this loss, Kaoklai started suffering more losses than wins.