Lin Yan, a modern university student, transmigrated into the body of a penniless scholar from a poor family, drowning in debt and on the brink of death. When loan sharks came to collect, Shen Xi, an illegitimate son of a merchant family, bought his debt contract for thirty taels of silver. To survive, Lin Yan used modern knowledge to renovate an abandoned water-powered mill. The thunderous “Thunderclap Mill” shook Qingyuan County awake, but also prompted Shen Xi to make an even shrewder move: secure exclusive rights to sell rice and flour, and monopolize the technology. Burdened with heavy debts, facing the narrow path of the imperial examinations ahead and creditors closing in behind, the poor scholar has only one choice: break through with thunder and wield his brush to shake the heavens!