Stellar Train: I Open a Small Shop on the Train - Chapter 52

Levi, a young man who spent over a thousand years in a cultivation world, awakens in a hospital only to discover that two years have passed on Earth. The world he left behind has completely changed—mysterious spiritual energy has appeared, transforming Earth into a cultivation world filled with monsters, undead cultivators, and mysterious places like floating islands.Though Levi is furious that the entity who transported him to the other world failed to stop time on Earth as promised, he must now face the new reality. In a world now filled with cultivators, interdimensional conflicts, and the presence of a cultivation leveling system, Levi struggles to adjust to his weakened human body while seeking to uncover what happened to his mysteriously missing family.

Ian Percus, the second son of a countryside Viscountcy.

One day, he received a love letter from the future.

‘If we don’t protect the future, the world will perish.’

With an ominous warning scribbled by someone

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

Being a normal man Axel lived a good life till he was murdered. Now he needs to navigate a new world where magic monsters fantastical races and mythical beast are everywhere. Join Axel as he navigates this new world full of wonders and hardship. Will he meet a gruesome end or find a life he can live happily. Oh, did I mention...This book is my second work. It'll have romance, and fighting. It'll have intrigue and vile characters. It will have R-18 scenes and much more. Give it a try.