Solving the Case is Slightly Bitter, My Sister is Super Sweet.

Summary

Lin Xuan investigates a complex murder case involving 13 deceased individuals, drawing parallels to Agatha Christie's "And Then There Were None". He theorizes that among the victims, one is actually the killer who orchestrated an elaborate suicide plot. The case involves psychological manipulation, forcing victims to commit suicide through threats or incentives. Despite the killer's meticulous planning to erase evidence like fingerprints and footprints, Lin Xuan remains determined to uncover the truth, viewing the investigation as an intellectual challenge. His team attempts to trace connections between victims, but finds the killer has anticipated and blocked every potential investigative approach.

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