Happening at the same time, the case of a murder on a ship and the case of swapped cargo shocked Shanghai. During the investigation, Qin Lun, battalion commander and Xia Qing Yuan, sergeant, realized that the Japanese army has begun to penetrate and invade Shanghai omni-directionally. As a result, Qin Lun and Xia Qing Yuan began to contact "Guardian", who united black and white to resist the Japanese army. However, the identity of "Guardian" is a mystery. Asano's standpoint was suspicious, even though he was named to be part of the pro-china faction. Until Qin Lun and Xia Qing Yuan's mutual friend, Shen Yi was killed. The truth was revealed…..