In July of the 23rd year of the Republic of China, a male corpse was found at the Zhabei tram shunting yard in Shanghai. His face was smashed and his identity was a mystery. Inspector Lu Liang of the patrol room took over the case and traced the only clue "Western Yunnan accent" and found that the deceased was Zhang Youren, a patrol officer stationed in Yunnan twenty years ago - a good man known as the "Bodhisattva".
Zhang Youren once rescued a seven-year-old orphan suffering from leprosy. Twenty years later, he met the child in Yunnan and made a special trip back to Shanghai to recognize him. However, he was killed as a result.
The killer smashed his face, erasing all traces of his identity. Lu Liang pursued along the "Chengbeiling" line and found that the orphan had already changed his name - now Zhao Yingliang, a Shanghai musician, the handsome future son-in-law, with a bright future. All the insiders "died unexpectedly" one after another before opening their mouths.
Zhao Yingliang has a song called "The Sound of Nature" that is praised by Shanghai. There is a secret hidden in that piece of music. When Lu Liang finally revealed the truth, Zhao Yingliang was standing at the boarding channel of Wusong Pier, preparing to go overseas. He is only one step away from his future. But Lu Liang stopped him.
A man who was saved killed his only benefactor. He bought a glorious life with a castle built of lies, but it completely collapsed the moment he boarded the ship.
