In this chapter, we learn more about the concept of the "innate spirit," which is a kind of magical force that exists in all things. The idea is that if you have a certain kind of spirit, you can use that spirit to create something else. For example, if you're a fire spirit, then you could use your fire spirit to build something else, like an ice spirit, or even a plant-spirit. It's not clear yet whether or not innate spirits are really strong or not, but it's been said that they are. Five days later, young master lang asks for an invitation to his daughter's 19th birthday party. He's super excited, but he's worried that he can't buy her a fancy birthday present.