When he was eight years old, the young master of the Mu family, Mu Song, survived in a "Mu family extermination case", lost his parents, fatherless and motherless, he could only be taken care of by his parents' friend Duan Minglang, and met Huai Nanyu, who was three years older than him, at Duan Minglang's sister's house, the two were childhood sweethearts, and when they grew up, the twenty-one-year-old Mu Xiang successfully took over the Mu business, and was like a fish in water in his career, Huainan Yu became the captain of the first team of the Nancheng District Public Security Bureau, but the clues reappeared, In a case of missing children, the same medicine was found to be the same as the case that year, and just when the whole case was burning his eyebrows, Mu Cheng actually left his company and went to the city bureau to meet Huainan and become colleagues! Is all this a long-term plan? Can the truth of the case be revealed?