This drama mainly tells the story of a young lawyer in Peking, Situ Yan (played by Hu Yitian), who was dismissed from his job for upholding the law and came to Harbin to become a detective. In the cases that followed one after another, he met his straightforward rich friend Luo Shaochuan (played by Zhang Yunlong), and got to know Zhou Mowan (played by Zhang Xinyu), who dared to love and hate, and together they uncovered a big conspiracy.