Modern policewoman Lin Qingxia transmigrates by accident to Shanghai in 1937 while on a mission. She awakens a portable spatial ability and gains a jade ring that can store objects.
Taking the place of Bai Meigui, a Paramount ballroom dancer who was murdered, she forges a new identity with the help of the ballroom manager, Ninth Master Chen. She discovers that the woman whose identity she assumed was actually an undercover agent for the Military Statistics Bureau.
Using her spatial ring to crack Japanese military codes, she meets up with underground Party member Lu Mingyuan, only to be surrounded by agents from the Special Higher Police. With her spatial ability, she makes a narrow escape.
While obtaining a map of Japanese troop deployments in Hongkou, her identity is exposed. The head of the Special Higher Police, Sato Kenji, sets a trap to test her, but she uses her spatial ability to move crucial evidence and avert the crisis.
While delivering the top-secret intelligence code-named “Sakura Plan,” she is caught in a sweeping roundup. To cover her comrades’ retreat, she deliberately gives herself away. Trapped in prison, she activates the ultimate power of her spatial ability.
