There is a long-standing legend about the Wangchuan River in the underworld.
If you want to meet your favorite person again in the next life, you have to jump into the Wangchuan River and endure a thousand years of torture without moving, talking, sleeping or eating. If you are not careful, you will have to wait another thousand years. If you can survive this thousand years, you will be able to fulfill your long-cherished wish after leaving the river.
However, no one knows whether this legend is true or false.
However, before Demon Lord Zhan Qi died, he said five words to Lord Si Zhan.
Do not cross the Wangchuan River.