Chen Huizhi, a young man from a well-known family in Shanghai, and Shen Yi, a young boy, reunited during a murder case in the concession. One look in their eyes showed that each other's innocence has not changed. The two used their wisdom as their blades and joined forces to track down the shocking conspiracy "Sakura Rain" colluded between the Japanese and puppets. Shen Yi's life and death were unknown in order to protect the evidence, and Chen Huizhi went to Hong Kong alone to deal with all parties. The bullet casing clues raised hopes but then fell again. Finally, in a desperate situation, he reunited with Shen Yi who had survived the disaster. Faced with the heinous crime of Tan Zongming's defection to the Northeast and the Japanese army's 731 Demon Lair, the two went north side by side, gambling with their lives, and vowed to make the truth known to the public in order to repay their country and comfort their heroic souls.
