Peiping, 1920s of the Republic of China.
Under the Zhengyang Gate, a newspaper vendor scattered the young economic consultant's case files - it was the second day after Geng Yuan reported to the police station. Another person who was probably just passing by knelt down to pick up the scattered pages for him. Han Chengping, the nominal special advisor of the police station, has a Nanjing accent and always carries a pack of Hardmen in his coat pocket.
A person who does not believe in power and guns, but only believes in accounts and evidence, and a person who is burdened with the old debts of the entire family and hides his thoughts in ashes and never pours them out. Starting from a murder case in a photo studio, they followed a path that was repeatedly erased and reappeared, passing through the ice corpse in Shichahai, the hidden gun in Guanghe Building, the fakes in Liulichang, the replaced serial number in the Union Herbarium, and the mystery box in which gold was exchanged for lead bricks at Qianmen Railway Station...
Twenty cases, each case is like an old map that has been torn into pieces. They thought they were putting together a complete answer, but found that they were just tracing out the cracks of the same era bit by bit.
Intention: Twenty cases, six years, two main lines - one is what can be found out through accounts and evidence, the other is what price people have to pay after the truth is found out.