New to the Secret Service? No, I'm a Ghost from the Old World

My sister is lying in the ICU with a dose of 700,000 yuan. Chu Jianghe is carrying the old debt from six years ago, and he has survived until now like a wild dog. They told him: "Wearing this uniform will give your sister a way to survive." Chu Jianghe entered the Fenglin Branch and became the most inconspicuous newcomer. His colleagues thought he was just messing around, his opponents thought he was an easy chess piece, and the people in the city bureau thought he was just an old sword eliminated by the Demon Suppression Department. No one knows—— His knife crawled out of the ruins of the old world. The blade was still stained with the blood of the twelve demon kings.