In this chapter, we learn that the bone marrow registry was done before he got sick, and that Dr. Cui is helping him cover up the fact that he's had a bone marrow transfusion. In other words, Dr. Caiminghao is helping Cai Minghao cover up his secret. The narrator tells us that the doctor is very kind and patient, but that he doesn't really want to make life difficult for his patient. He just wants to make things easier for him.