Shanghai in 1943 was a cage without a shore.
Duan Mujing is the quietest female employee at Agent 76 headquarters. When everyone mentions her, they only remember "Oh, that girl from the Duanmu family, she is very well-behaved, talks little, and doesn't cause trouble."
No one knows that she is "Guizhou" - the deepest nail planted in No. 76 By the underground party of the Chinese Communist Party.
Until He Lianzheng appeared.
He is an ace agent sent by Chongqing, codenamed "Sanchi". It is said that this person was ruthless and once took down a Japanese intelligence station in Wuhan overnight.
His mission: to find out the Communist undercover inside No. 76.
Her mission: to send the last piece of information before being exposed.
They work in the same building and don't know each other.
Until Duanmujing received the order from the organization - "Return to the boat, cooperate with 'Sanchi', and cover his actions."
At that moment she realized: the person the organization wanted her to protect was the one who came to arrest her.
And He Lianzheng also received a top-secret telegram from Dai Li - "Sanchi, there is a Communist Party around you, find her."
What he didn't know was that the person Dai Li asked him to find was the person sent by the organization to protect him.
There is only a thin line between enemies and comrades.
When the truth is revealed - who is acting for whom?
