The Great Demon System - Chapter 445: Two Sides of the Same Coin.

The formless ancient world was infested with despicable demons. They hunted and feasted on mankind, keeping the human civilization constantly in a weak and suppressed state.

Han Yun was spoiled from childhood.

He survived past his emperor dad and crown prince elder brother, and became an emperor.

He didn’t know how to govern the country, but he was lucky—there was a Grand Preceptor who “assisted” him, spoiling him even more than his father did.

After just a few years, this puppet emperor died. When he awakened, he had transmigrated into the modern world, becoming a third-rate model struggling alone without any loving parents.

Just when he thought he had become a little cabbage that nobody wanted and no one would ever spoil him again, a certain ancient monster of a Grand Preceptor who had lived 1,000 years appeared again… and looked to be doing quite well for himself.

The utterly impoverished little emperor had tears in his eyes: “Beloved subject! Zhen (royal We) have missed you so much!”

Grand Preceptor: “Your Majesty, this minister has waited for you for a thousand years.”

- Description from Novelupdates

A gas explosion caused Bai Xue to be reborn on Bai Ruxue’s body.

Fortunately, her department store followed her. Rice noodles, grains and oils, vegetable and fruit snacks, clothing and department stores are all available.

She took the supplies in her hands and exchanged money for a house, a car, a job, and gold!

Threatening, with the supermarket in hand, I have the world.

Zhang Mou came to the door: How to repay the grace of saving life?

If the handsome man is like this, the grace of saving his life should be promised with his body!

- Description from novelbuddy

Yang Feng somehow transmigrated into a different world and received a legacy of an ‘ancient high tech’ family, which does not directly raise his power, but gives him the technology to build things which are way more advanced than the seemingly medieval world.