The Song Dynasty's Number One Live-In Son-in-Law

I, Jiang Zhushan, was a tycoon worth billions in my previous life. In this life, I'm a penniless widowed doctor in the Song dynasty, lucky enough to be taken in as a live-in husband by the rich widow Li Ping'er. Sure, I have to get up earlier than a rooster, sleep later than a dog, work harder than a donkey, and put up with having no status or dignity, but at least I'm no longer doomed to be a bachelor. What I never expected was that I was merely a tool in my wife's revenge. To avoid becoming cannon fodder, I had no choice but to secretly start a plan to change my fate. They say the Tang dynasty was filthy and the Song dynasty chaotic, but I, Jiang Zhushan, don't fear chaos, because thriving in the midst of it is what I'm best at...