Forensic doctor Su Mu was wrongly imprisoned for ten years. After being released from prison, he transformed into a cleaner and infiltrated his enemy He Peng. He calmly threw out evidence from old cases and dragged He Peng's family into the abyss one by one, causing the arrogant rich man to collapse mentally in panic. Policewoman Chi Wanqing secretly joined forces with Su Mu while re-investigating an old case. When He Peng frantically exposed his crime in court, Su Mu quietly disappeared, leaving only a suspense about the deeper sinister story.
