"The best way to fish is to cultivate your mind; if the pond is not still, how can you catch the world?" - The protagonist uses the fishing rod as a weapon and the inner lake as a dojo. From fishing for things in the pond to fishing for the cause and effect of heaven and earth, and the fate of time and space, he understands the way of heaven through cultivation and fishing, and finally achieves the supreme realm with "fishing without hooks"
