The legendary detective of Longcheng in those years, Cheng Xu, after going through the death of his beloved Wei Qiuting and his biological younger brother Zhou Zi Yuan, also witnessed his adoptive father Wei Si setting fire to himself. Since then, he has been disheartened about his detective career, resolutely throwing away his detective license and firearm license, deciding to retire and no longer take on any cases.
Cheng Xu, who has put down all the cases, used all his savings to buy an old building, gathered流浪children such as Little Shunzi, and opened an orphanage. He made a vow in his heart that his tragedy would not happen to these可怜children. Afterward, he devoted himself to educating these children, and although he was busy, he enjoyed himself.