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

Summary

In a detention center, Lin Xuan interrogates Yang Gen about suspicious corpses. Yang Gen reveals the corpses had unusual cherry-red livor mortis, suggesting protein extraction. Liu Changjiang theorizes someone might be extracting life force or proteins from bodies, potentially for anti-aging research. Meanwhile, the secretary is found dead, murdered with a triangular military dagger. The investigation reveals a sophisticated crime with carefully cleaned crime scenes, indicating professional mercenaries might be involved in these mysterious killings.

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