Silvern Mask

Li Xiao transmigrates into General Yin Mian—but instead of quietly rooting out traitors, he gets publicly dumped by his fiancée Su Nianxue, who calls him a 'worthless good-for-nothing'! Li Xiao: 'Fine—have it your way.' Next thing she knows? He aced the imperial exams (not by cheating—but with real genius), invented the Zhuge repeating crossbow, and eradicated smallpox with cowpox vaccination.

Li Xiao transmigrates into General Yin Mian—but instead of quietly rooting out traitors, he gets publicly dumped by his fiancée Su Nianxue, who calls him a 'worthless good-for-nothing'! Li Xiao: 'Fine—have it your way.' Next thing she knows? He aced the imperial exams (not by cheating—but with real genius), invented the Zhuge repeating crossbow, and eradicated smallpox with cowpox vaccination.