Lu Zhiwei's scalpel cut open not only the corpse, but also scars that had not healed for twenty years. During the murder on a rainy night, the metal fragments she pulled out from the nails of the deceased were exactly the same as the "butterfly bone" scars at the scene of her mother's murder. The serial killer "Taxidermist" stalks her with broken-wing butterflies and weird nursery rhymes, and each murder echoes her deeply buried childhood memories. The sharp edge of the criminal investigation captain Gu Chen collided with her calmness. From tit-for-tat to chasing the murderer side by side, she encountered a hidden obstacle from the top of the police force when she was getting closer to the truth. When the murderer placed her mother's belongings in front of her and said with a smile, "It's time to complete the final specimen," Lu Zhiwei realized that the testimonies hidden in the bones had been waiting for her to cut them open with her own hands - including the past that she did not dare to touch.
