One Word Changed, Characters in Chaos - Chapter 244 - 10 Maintenance

In the end of the world, the fittest survive.

Come back from rebirth, seize the opportunity, just want to survive in the hopeless end times.

Three months before Mu Nan returned to the apocalypse, he sold all his savings to accumulate supplies, hoarded everything he could hoard like a hamster, and then huddled in his own house and lived a low-key life, carefully waiting for the apocalypse to come step by step…

- Description from Novelupdates

He became a teacher at the best magic academy in the empire.
….For being mistaken for someone else.

He had once obtained a high levelled medical knowledge, martial arts and a Special Ability which allowed him to see through the other party's thoughts. With this, the Young Master Han was able to roam the society, shopping malls, medicine courts, and government officials.

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Ye Yun traveled to the Star Railway World and obtained the “Shop of All Worlds” system.Through this system, Ye Yun can sell items from across different worlds and invite guests from other realms to visit the Star Rail.His first encounter is with a space traveler named Stelle, and soon... many new experiences begin to unfold.Each time the shop's turnover reaches a certain amount, Ye Yun receives a reward from the system.