Volume 1: Survival in Chang'an (Chapter 1-50): Shuang Galen adapted to the ancient environment and used accounting skills to help Su Chengye's subordinates sort out the chaotic grain and grass ledgers, discovering loopholes in the military rations that had been withheld; using hand molds to help the talisman repairman draw low-level talisman seals, solving the problem of "waste of talisman paper", and initially gained Su Chengye's attention; he joined the lowest level "Chang'an School of Calculation" (a fringe institution that combines secularity and immortality), and began to explore the path of "calculation cultivation".
- Volume 2: Coming to the fore (Chapter 51-150): Entered the Su Chengye Mansion as the "Mr. Accountant", used modern accounting methods to reform the government's finances, and plugged the corruption loopholes of the cronies planted by the family; in the "Chang'an Material Distribution Case", used "cost collection" "Yi Model" predicts the risk of the grain road being robbed, adjusts the transportation route in advance, and saves key grains; at the same time, he practices "calculation elements" and can accurately control the calculation elements with both hands to draw low-level talismans with "increased accuracy by 30%", attracting the attention of fringe forces in the world of immortality.
