Once upon a time, a man named Zhu Piman wanted to learn a unique skill that no one else knew. He sold all his family property and went abroad to find a master to learn from.

After three years, he returned, having mastered the art. He proudly explained to people how to slay dragons, and everyone admired him. Children even asked to see his dragon-slaying sword.

However, an old man remarked, "Though your dragon-slaying skill is superb, there are no dragons to slay in the world today." It was then that Zhu Piman suddenly realized the futility of his impressive but impractical skill.