The war is raging, the mountains and rivers are in danger, and Shanghai under the neon lights hides the coldest spy war murderous intention. Fan Lu, an underground party agent, walks on the edge of a knife just to protect the peace of her family and country. However, while performing her mission, she bumps into a figure that has been etched in her heart for thirteen years - her long-lost sister Sissi.
As fate would have it, my sister was dressed as an enemy agent, had all her past wiped out, and became a murderous weapon for the Japanese army. Biological sisters once confronted each other, facing each other at gunpoint. Family affection and righteousness, redemption and domestication, were fiercely pulled together in the whirlpool of troubled times.
They were in darkness, each going on a mission. In the baptism of blood and fire, they experienced the entanglement of love and hate, and the test of life and death. In the end, they had to make the most difficult choice between blood and attitude, and write a heart-stirring spy war legend of the Republic of China.
