Winter Fireflies

In the park on a winter night, a corpse was hung from a tree. Fireflies were discovered at the scene. A strange note at the scene requested policeman Wu Ba to solve the case. Wu Ba was involved in this bizarre murder, but found himself entangled with two unsolved cases from more than 20 years ago... Walking into the fog, Wu Ba saw a period of 30 years of crime and revenge, and he was actually the fruit of the crime.