The forensic doctor's scalpel hung in mid-air - this was the evidence from the day his sister disappeared, and it was also the "murder weapon" that sent Pei Su's mother to the execution stand.
When her knife searched for the truth in the corpse spots, his pen buried traps in the case files; when she suffered from insomnia for seven years because of her sister's disappearance, he drew butterflies for his mother's unjust death for seven years. The dark cocoon is wrapping up more deadly secrets, waiting for them to break it open with their flesh and blood.
Seven years ago, her testimony as an eyewitness became the last straw for his mother; seven years later, he held up the knife of "procedural justice" and nailed her as the number one suspect in his sister's disappearance.
In the cold light of the autopsy room, she found that he was always looking at her hands - those were the hands that could distinguish 0.1Mm scars, and they were also the hands that pressed fingerprints on the testimony. And there will always be a pale pink scar on his palm, which was made when his mother painted butterflies with blood before she was executed.
When the cocoon was peeled away with a knife, they finally touched the core of the darkness - it turned out that all the pursuit was waiting for two people who were covered with bruises to break through the dark web of fate that had been woven for ten years with love.
