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

Summary

Lin Xuan investigates Xie Zhi Peng's mysterious disappearance in Leon city near the Thorn River. After extensively searching underwater and the river embankment for hours, he discovers a perfectly camouflaged hidden door in the stone wall. Removing the door, he finds a water tunnel leading to a small concealed chamber. Upon entering the chamber, he is immediately confronted with a pistol pressed against his head, suggesting a carefully planned and executed hiding strategy by Xie Zhi Peng.

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