Lin Jian, an escape room designer, learned criminal investigation knowledge by herself and became a part-time detective due to the mysterious disappearance of her mother when she was a child. She cooperated with forensic doctor Cheng Zhao when deciphering the "Blood Puzzle", and gradually discovered that all the cases pointed to a secret base in the name of "redemption" - where "problem people" labeled by the powerful were imprisoned, and the mastermind turned out to be Shen Jin, her most trusted neighbor in childhood. When Cheng Zhao's sister was also involved in the base, Lin Jian and Shen Jin started a life-and-death game. While exposing the shady secrets of the base, they also had to face the ultimate torture of the good and evil of human nature. (Highlights: The intertwining of the case and old childhood cases, the bond and opposition between the villain and the protagonist, the professional collaboration between forensics and detectives)
