Wen Sheng, a mysterious detective who lives in seclusion in the alleys of the ancient city, is used to using a violin to reveal the truth in the fog. He is not for money, not for glory, but just to pursue the lost love song - a riddle left by his beloved lover a few years ago, which becomes his guide on the way to solving the case. Every strange case is like an unfinished poem, leading Wen Sheng to meet all kinds of characters: doubts are like pictures, and emotions are like songs. As he gradually uncovers the truth behind the serial disappearances, his former lover reappears with a strange identity, and every puzzle tells the story of the battle between love and trust. Wen Sheng struggled between rational reasoning and fiery emotions, and found that some answers were not in the evidence, but in the heartbeat. The story sees the world through the eyes of a detective, solves mysteries with the heart of a lover, blends mystery and romance, and allows true love and truth to dance together in the fog.
