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

Summary

Lin Xuan, a skilled assassin, infiltrates a high-security villa in London to eliminate Wang Chu Yuan, a pharmaceutical CEO who betrayed his country. After silently killing fifteen elite royal guards, he discovers a decoy in the bedroom. The real Wang Chu Yuan appears on a monitor, revealing his controversial research on immortality involving unethical experiments like blood transfusions and embryo seizures. The target suggests his work is connected to extending life, even hinting at the Queen's possible involvement. Lin Xuan realizes this mission is more complex than a simple assassination.

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