Kami-sama no Memochou - Volume 6, Gigolo—sensei, the Last Lecture

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

Once upon a time, a hero had been summoned to a different world in order to defeat the demon king. After the war stretching 3 years ended the commendable hero slew the demon king. And he was forcibly deported back to earth after being dismissed.

Such bullshit!

Elves in addition to beast race, dwarfs and demon race. Even though I wanted to make a harem in the different world I saved! My dream will not come true on earth, where there is no magic at all. Thus, the hero returns on his own. Without the blunder of being extradited to earth this time, he will build a harem of his own in a different world.

The Demon King dies and the entire Demon Realm perishes in the prologue of “The Demon King is Dead,” and I have become the Demon Prince of that novel.

… Somebody save me.

……………………………………………………………

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Reinkarnasi, apakah itu kebetulan atau tidak terhindarkan? Lu Ditinggalkan, terlahir kembali ke dunia seni bela diri ini dengan realisasi seni nasional tertinggi.

Di sini, dia telah mendapatkan harta karun dan mencari surga, para budak perempuan dan para dewa … mari kita menjejakkan kaki di dunia keabadian ini, surga dan kehidupan abadi!

- Description from Piaotian