Synopsis: In 1941, the occupied areas of Shanghai were peaceful on the surface with singing and dancing, but behind the scenes there were swords and swords. Chen Mo, a young translator at Agent 76 headquarters, works every day to translate interrogation records into Japanese. He thought he was just an ordinary person making a living in troubled times, until an encrypted telegram changed everything - he discovered that his mentor at Tokyo Imperial University was actually the head of the "Nightingale" group of military command. Three days later, the teacher was about to be put on a prison car bound for Nanjing. There were only two choices before him: continue to be No. 76'S "deaf ear", or push open the bloody door leading to the tip of the knife.