From the start, Chen Changshou transmigrates as a cripple. He'd planned to lie flat and do nothing, but unexpectedly obtains the Longevity System.
As long as he doesn't die, he can live forever.
So, to earn enough money to spend for all eternity, Chen Changshou has no choice but to become a unscrupulous merchant, swindling princes and nobles every day.
While everyone else is wearing bellybands, Chen Changshou produces exquisite bras that shape the figure and sells them across the country.
While everyone else is using plant ash and scraps of cloth to get through their periods, Chen Changshou produces breathable sanitary pads with leak protection, drawing millions of women across the land to buy them.
While everyone else...
As his business grows, Chen Changshou's fame soars, and everyone starts calling him a friend to women.
One day, when Chen Changshou's wealth surpasses the emperor's, everyone realizes that this unscrupulous merchant, always either swindling people or on his way to swindle them, has secretly been controlling the entire country.
After three years of drought, not a single grain is harvested anywhere in the nation. The emperor runs out of money and has no choice but to buy on credit from Chen Changshou. Chen Changshou purses his lips and says, "I'll advance you fifty million taels. Sign an IOU!"