The Rusty Sword: Wanli Jianghu Chronicles

In the seventeenth year of Wanli, Shen Yanqiu, an abandoned member of the Cao Gang, lived in seclusion outside Yangzhou City and made a living by repairing umbrellas. An oil-paper umbrella with his birth date engraved on it got him involved in a tax collector's corruption case - the umbrella ribs contained secret accounts of the loss of Jiangnan tax money, and the pursuer was none other than the commander of the Jinyiwei who massacred the division. When the number of acres on the fish scale album overlapped with the ink marks on the bodyguard's account book, and when the Shaolin monk's sword slashed at the North Korean envoy's post horse, he discovered that what he had polished was not only the rusty sword, but also the truth obscured by the creed of "the world is all about the world": the so-called chivalry could never escape the tax calculations and border wars of the Wanli period.