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

Summary

Zhao Qiang, a soldier with extraordinary power, reveals his tragic past of seeking his disappeared sister. Through brutal methods of obtaining superhuman strength - involving stimulants that drastically reduce life expectancy - he infiltrated and eliminated 13 criminals connected to her disappearance. His ultimate goal was to uncover the truth about her kidnapping and draw out the mastermind, Chu Pu Li Na. Despite his strategic brilliance, he ultimately sacrifices himself, becoming "Zhao Guo", a new identity serving the Dragon Kingdom, symbolizing his complete dedication to finding justice and serving his nation.

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