Singing the Warbler in the Long Night

Twenty years ago, the kindergarten was destroyed in a sea of ​​fire. No one survived, and the sin was buried in the dust. She survived the scorched earth, lay dormant for many years, put on a white coat and became a forensic doctor. The successive serial murders shocked the whole city. Next to each corpse sent to the autopsy room, there is a trace of the nightingale's sad singing. The police department made every effort to track down the "Nightingale" who caused the killing.