The protagonist Nai He traveled from the current year of 2012 to the Northern Song Dynasty, and met Wu Song at that time in Jinggang Mountain. By an unexpected combination of circumstances, he saved Wu Song's life, and the two became sworn brothers from then on. Then a series of things happened based on the plot of Water Margin at that time. Of course, Naihe also changed many things, which changed the views of future generations on Wu Song.
At the end of the story, the two of them traveled back to modern times with Zhu Ziwen, who saved Wu Song's life, and started a new life.