In this chapter, we learn that Lin Suer has invented a device that measures the level of the toxin in a person's body using an infrared ray. This device is so precise that it can be used to track the exact concentration of the same chemical in the body of a person who has not yet experimented with the device. This is because, according to the device's instructions, it is not necessary for a person to draw a blood sample to measure the amount of the chemical in his or her body. The narrator then goes on to explain that although Bo Qingang is born with a "serious mysophobia" , he is not afraid to touch a woman. He simply needs to make some "intimate behaviors," such as holding hands or hugging, to overcome his fear.