By understanding the nature of monsters. In the fantasy mathematical war, the solution to the problem is to understand the nature of monsters. For example, in episode 1 of the fourth season, Ji Xiu learned that monsters are actually energy generated by the name "everything counts". He realized that these energies shuttled between different digital domains, so instead of simply "killing" these monsters, he found a way to send them to the digital domain where they should be. In the second episode of the fourth season, Ji Xiu understood that monsters are the energy of the name "everything is counted", and he found that these energies increase with the increase of quantity. Therefore, he did not simply "kill" these monsters, but sent them to the digital domain where they should have been by increasing the number.