Lei came to Japan pursuing Feng Wei; however, Feng's trail ended and he was unable to catch him. After returning to Hong Kong, Lei continued to search for Feng. Unfortunately, he was ordered to suppress several disturbances occurring around the world and was unable to continue his quest.
With large-scale war plaguing the earth, Lei learned that the Mishima Zaibatsu was quite active behind the scenes. He therefore infiltrated The King of Iron Fist Tournament 6 to catch the true culprit, Jin Kazama.