The carriage was running on the ground, and on the ground was the world of humankind. If the Headmaster had figured out "how", he would've left for battling with Haotian early instead of sitting in the carriage.
"I thought about it for a long time but did not have any idea how." The Headmaster said, "Hundreds of years passed by, and one day I met the guy named Ke Haoran, your Youngest Uncle."
Ning Que was depressed at the moment, but his face lighted up at the mention of "Ke Haoran". He was excited and he could feel the Great Spirit of his Youngest Uncle flowing in his body.
The Headmaster then said, "Your Youngest Uncle was talented, or a genius as others called. He learned things quickly. He never knew what a Knowlege barrier was, but it was a pity that he had such an odd temper, and there were many things he refused to learn."