Because from the seventy-first chapter of the Water Margin, we can see that "an apricot yellow flag was erected at the top of the mountain, and the book said," four characters. It means that Liangshan hero is the embodiment of justice and does things instead of God. What they did was arranged by God. God is of course fair to everyone, and it is impossible to be partial to you just because you are a great person.
The slogan "Water Margin" is directed at Kyushu, and it should be done when it is time.