The Demon Ledger

Transmigrating to the Great Yu dynasty, Shen An becomes a demon hunter on the government payroll. While others risk their lives killing demons, Shen An 'settles accounts' with them. With the Demon Ledger in hand: demon cores are purified with zero pollution, weaknesses are analyzed for instant defense breaks, and battle reviews are flawless. While others are still fighting over a single demon core, Shen An has already risen in rank through 'grinding monsters + reviewing battles.' Demons? Just numbers in the ledger. All the demons under heaven, watch as I cross them off one by one! — Description from novelcodex.org