Ding Huaijian, a clerk in the Ministry of Revenue's Accounting Office. His daily routine: pore over ledgers, check figures, and eat wontons with his colleagues.
His motto in life: Make no mistakes.
Until the first month of the twentieth year of Zhaoshuo, when he discovers that the accounts for the Ministry of Works' renovation of Taiye Pool don't add up. Three thousand taels, more than twice the amount spent in previous years.
He hesitates for three days, then sneaks into the Eastern Palace under cover of darkness.
From then on, his daily routine becomes: pore over ledgers, check figures, get summoned by the Crown Prince late at night, climb through his colleagues' windows to copy down evidence, hunt down people at the border, investigate grain supplies in Huainan, and stake out locations in Huzhou.
(This should be an ensemble story, with no romantic pairings.)