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

Summary

Lin Xuan infiltrates a high-security villa, systematically eliminating multiple guards with precise gunshots. He confronts Wang Chu Yuan in a safe room, methodically breaking through the bulletproof glass using explosive shells and his extraordinary strength. After interrogating Wang Chu Yuan about a controversial human protein hormone research project involving unethical experiments, Lin Xuan ultimately executes the elderly man, revealing a personal vendetta connected to the victim's past actions.

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