What does Fang La mean by saying that "it's all about killing tigers and Song Wu"?

What's your martial arts level in Song Wu? I was pawned by the bad king. Today, although my martial arts in Fang La is not as good as yours, I know that people's livelihood is suffering in the dark, and dare to gather a group of people to raise a three-foot sword to open up a future for the bad king. By contrast, you beat Tiger and Song Wu, but that's all.

Heroes in the Water Margin are all skilled in martial arts, and their limitation lies in trying their luck with the bad king. I don't know that the reason for the darkness in North Korea is not the treacherous court official, but Song Huizong. 108 people, the mainstream thought is nothing more than building a court or living in seclusion, but dare not overthrow the court. Dying because of building a court is just a pawn being used. If you can die to open up a new world, you will not be a hero. Fang La's sentence "Killing tigers and Song Wu is just so much" also implies the tragedy of heroes in the Water Margin.