Marry a Bad Son-In-Law

It is said that in the last years of Daqing, when the country was subjugated, a couple came out of the folk. One of them fought against all opinions and introduced Western diagnostic techniques to Daqing, setting off a medical revolution. The other traveled the battlefield and the border in the name of a spy, regaining the "gun" that was taken away by foreigners hundreds of years ago. It was rumored that the marriage between the couple was due to a "fraudulent marriage". One was a powerless lady, and the other was a notorious scoundrel. In troubled times, little people are also writing their legends. (Love story 1v1, handsome rogue, cute scoundrel x smart, capable and talented lady, male and female protagonists are clean physically and mentally)