Psychological Mysterious Case.

Summary

A mysterious killer targeting individuals with transplanted hearts from executed death row prisoners commits a series of brutal murders. The killer believes that transplanting criminal organs is a sin, and leaves behind hearts at a criminal investigation drama's opening ceremony. Three victims with past criminal records are found dead, with their hearts removed and a message "Heart's Sin" left behind. The criminal investigation team, led by Song Ao Yue and including Su Yun, works to unravel the killer's twisted logic of punishing those who received organs from criminals, suggesting a complex psychological motive behind the gruesome killings.

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