Memories and codes from the past.

Episode 20:
Hong Mei and Captain Chen interrogate prisoner Li Guang Ming. He confesses to stealing the documents. But one of the facts he denies having participated. One of the nurses is a true friend of Bai Hui. Mister Bai questions his daughter why she was so wronged in the police case. The miniature model of the submarine can float, but its undulations are not yet perfect. Dan Yang assists the team. He says the water drop shape is best suited for the submarine. Bai Hui is removed from her duties at the hospital and suffers hostility in public places. Bai Hui's enemy nurses are angered that Bai Hui was immediately reinstated to her duties at the hospital by Director Ge. Hong Mei sets a trap and manages to catch the nurse who sabotaged Boss Chu's medicine made by Bai Hui in the act. And Hong Mei discovered that this was revenge for Dan Yang's jealousy, in an incident involving an apple. But, they understand that she is not a spy. Nurse Du Fang is fired from the hospital. The nurse, Bai Hui's friend, gives her a letter that came from Sweden. Bai Hui, burn the letter, and disguise the act. Bai Hui goes to the library looking for a music book. Both she and the librarian showed suspicious glances at each other. Bai Hui disguises to Mister Bai what she was doing with the book she brought. Bai Hui remembers her childhood when she was kidnapped and then saved by her adoptive father. Mister Bai realizes that his daughter is sick and gives her medicine. Bai Hui reads a letter in which a man wishes her well and tells her about a date, the 22nd. Bai Hui tells herself that the message has arrived (it seems that the note was some code). Hong Mei finds no trace of her father. She says she last saw him in 1944 when the Japanese had not yet surrendered. She remembers this moment, when a little girl, cried as she said goodbye to her father. An officer informs Hong Mei and Captain Chen that in the list of those who died in the Lumen massacre, there was no name of Hong Mei's father. They suspect that the snow wolf is the killer who perpetrated this massacre in Lumen.

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