Traveling Through Another World from Parallel Time and Space

How about the idea of ​​traveling through parallel time and space to change the past, and then merging the two time and space. After becoming invincible, Fang Tong went to parallel time and space to change the past, but when he returned, he unexpectedly came into contact with the vast world of the heavens. He discovered that all worlds are man-made creations. So where does your world come from? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.