Wei Linggan is a person who suddenly appeared in ancient times. Her will to survive quickly led her to find work at a blacksmith's shop. She performed so well and proved so capable that she rocketed up the ranks, becoming the shopkeeper in just six months. Princess Wulalan of the royal family stamped her approval three times, and came to value Wei Linggan's talent so highly that she even asked to renew her appointment for another term. She extended an enticing offer: official identification, household registration, and a property deed.
In other words, the princess knew Wei Linggan had no traceable background, but didn't care. As long as she wasn't a truly evil person, it didn't matter what kind of monster or demon she might be.
The world of this country is enviable. It places great importance on people's livelihoods, to the point that the royal family sometimes has to subsidize them. So nobles and aristocrats all pitch in, and none of them can coast on their inheritance. They all have to work.