1938, Yanjing. Shen Fangzhi, a member of the telecommunications section of the pseudo police station, is a taciturn person. No one knew that he was the platoon leader who survived the Battle of Songhu, and he was the only one left in the platoon. No one knew that the mental trauma awakened a talent in him - he could "sniff" the key directly from the messy ciphertext. Super High School Masao Sato uses new passwords one after another, and the Yanjing underground party is in danger one after another. Shen Fangzhi was forced to decipher the first secret message, at the cost of a severe migraine and the suspicious eyes of his comrade Su He. But the secret cable revealed a large-scale raid plan targeting the base area. He had to risk everything. From then on, during the day he was a submissive pseudo-policeman, and at night he used his talent to tear apart the enemy's disguise. Anti-rape operation: The traitor Zhao Bingyi was "accidentally" cut in the throat in a brothel; female military agent Ye Wantang and him joined forces in the dark night from mutual testing; and Su He, the sister of his sacrificed comrade who he swore to support, finally gave him decisive information with her life... When Masao Sato pointed the gun at Shen Fangzhi's temple, he smiled: "You never know, in my eyes, your password is just a piece of white paper."
