Shanghai fell, and the island was in danger. The former lover Su Wan has become a guest of the Japanese invaders, and the decadent pianist Xiao Ran has received a secret order to eliminate her personally. Codenamed "Isolated Island," he is the most mysterious killer in the military. He also has an ability that no one knows about: he can talk to animals. When he ordered the homing pigeons and rats to lay a dragnet, he found that he was still a pawn, and what she held tightly in her arms was the blood-stained copper ring left by the homing pigeon "Xuanyi" that they had fed together and had now become a spirit. This is a spy war that is invisible in the eyes of animals. Every note is a secret signal, and every look is a test of life and death. In the country, they are hunters and prey; in love, they are the only old dream that they dare not recognize each other. When the muzzle of the gun was finally aimed at the heart, Xuan Yi's cry tore through the night sky - did it bring an ultimatum, or a promise of reunion that spanned life, death and betrayal?
