Yan Shi is worried about the mourning Zhai Li and confides in Pan Sen. Qi Rong finds out they are dating. When Jin Zhen loses track of time and is caught using the calculator at midnight, he is detained in the detention room. To everyone's surprise and Zheng Dang's amusement, Jin Zhen enjoys the quiet time in the room. Zhai Li teaches Jin Zhen how to use the computer to calculate faster. Zheng Dang and Chief Lei go to meet enemy spies seeking protection.