Academy’s Undercover Professor - Chapter 271

Ruins stretched across the landscape in the apocalypse after the nuclear war.

When a man finds himself in the presence of absolute power, what will he do? Dying has already happened, but he wasn't given permission and the creature responsible finds his tragedy amusing. Forcing him to continue his life in a new world, he is given an unknown task that must be completed if he ever wishes to rest.

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One day, Luo Jian woke up from his sleep and found himself in a locked chamber where the door and window were all sealed. A note with a few lines written on it was tacked to the wall: “Escape from this room within an hour, otherwise, you will die.”

There is a sequel called Reincarnation Night (轮回之夜) that takes place in the same universe but has different main characters

- Description from Novelupdates

Jung Sunwoo was an average man. He had just taken his first job at W&U, a celebrity management company, as a manager. He could finally achieve his dream of being the manager of a world-famous actor or actress. On his way to work, he fell into what appeared to be a lucid dream about his future. As he went on with his day, he realized it may not have simply been a lucid dream.