In the Gulou Hospital under Japanese military control, six medical staff were secretly placed under house arrest.
An underground intelligence agent code-named "Echo" is hiding in it and holds key information about the Japanese army's "Decapitation Operation." Japan's Special Commissioner Masao Matsumoto announced that the spies were among the six who had been identified. If the "Echo" was not handed over, all of them would be executed in 48 hours.
There is no help within and no support from outside.
Shen Jing, a meek surgical nurse, started her silent war under everyone's gaze.
But what Matsumoto doesn't know is that there may be more than one real "echo" in this secret room.
When history is written repeatedly, the truth will become the sharpest knife.
