The Eldest Princess' Farming Story

How can an older, unmarried female man be reborn in the late Eastern Jin Dynasty when the emperor is in power and the people are in dire straits? How can he help his dear family to rebel and rise to power, gain beautiful love, and become a winner in life? As a newly minted prince-in-law, how can he help the newly minted and cruel princess conquer the troubled times and support her father-in-law to unify the country? Faced with a ferocious queen mother, a henpecked father, and several relatives who are suspected of being patients with schizophrenia, how can the "brave duo" properly maintain relations within the royal family, promote royal harmony, and ultimately achieve unification of the world and happiness and well-being for the people? In short, this is a warm and sweet history of development in another world~