A few minutes after Dr. Bai entered the laboratory, another doctor went in. The last time an explosion occurred, the monitors in the laboratory were damaged, and they have not been repaired. Dr. Cai tells the others to check the identity of the staff in the building. He tells Cai that he has to catch him red-handed. Cai says that it is too dangerous for them to be apart, and that he only has Cai's guidance. He says that he is still angry because of Cai, and he is worried that Cai will not let him go. He is angry that Cai did not tell him these things, and is afraid that he would never see Cai again. Cai asks what should they do now that there is movement.