Su Qinghe is a well-known "iron abacus" in the West City of Beijing. No matter how messy a bad debt is, she can sort it out overnight and find out the moths hidden in the account.
She lives her life guarding a market stall and just wants to find out the truth behind her parents' unjust deaths. However, she is approached by Xie Jingxing, Prince Jing, who is ordered to investigate the huge deficit of the national treasury.
The other party offered her a sky-high commission, and even promised to help her look up old cases, on the condition that she help him uncover the shocking secrets in the account books.
From the bad debts of merchants in the market, to the confused accounts of the six departments of the court, to the treasury deficit case involving collaboration with the enemy and treason, Su Qinghe used an abacus and a pair of sharp eyes to tear apart the layers of shady stories.
She is not afraid of corrupt officials, nor is she afraid of the power of aristocratic families. She settles the world's accounts one by one, and walks to the court step by step.
In the end, she cleared her parents' grievances and became the first female minister of the Great Qi Dynasty. She joined hands with King Jing who fought side by side to protect the thousands of miles of mountains and rivers and the lights of thousands of families.
Purpose: to uphold the right path with a humble body, to protect the family and the country with the talent of arithmetic, and to keep the mountains and rivers clear and the people happy even if the road ahead is thorny.
