In this chapter, we learn that the protagonist has fallen in love with a girl named Xiuming, who is also the protagonist's crush. The two of them have been together for four years, and the protagonist admires the girl's beauty and intelligence. He tells the girl that he admires her too, but he doesn't know whether or not he likes her. The girl tells him that she has no idea what her crush is thinking, and he tells her to hurry up and find out. The protagonist then tells us about the latest developments in the field of molecular phylogeny. It turns out that biological evolution is divided into three major branches: archaebacteria , prokaryces , and eubacteria . The phylogeny of biological evolution shows that during the evolution of the dna, the changes in dna plasmids are mainly shown to be the difference between the two groups. In other words, during evolution, the change of dna can be seen as a change in the basic structure of the organism. The chapter ends with the protagonist admitting that he has lost, and that he will not bother the girl anymore. He then tells her that he still has "chrysanthemums in blossom," "bonemend tea," "buddha sticks," and "strong hero pills" .