Sanctuary: Safe Haven - Chapter 365: Tonitrum Vs. Archdemon

Life is often full of curveballs. It likes to keep you on your toes.But what can a regular guy do when he gets booted to a world full of gods, dragons, devils, angels, yokai vampires and everything in between with only the clothes on his back and a reality-bending gacha behind him?His best apparently.

He, since childhood, had followed the Foreigner to practice the Defying Heaven Art, entering the most secretive special forces and becoming a fearsome assassin that made others tremble at the mere mention of his name. After a single failure, he took early retirement, but he ended up as the personal bodyguard for a rich heiress, a school beauty. Accidentally provoking some mysterious Cultivators, he gradually unveiled a hidden world of Cultivation beyond the mortal realm...

I was reincarnated into another world, and I’ve brought the Horadric Cube from Diablo II with me.
Being a knight is cool and all, but being a wizard is pretty neat as well.
So, which one will it be?

- Description from Novelupdates

Well-known Composer Fang Zhao was in the glorious stage of his career, when the Apocalypse arrived; After finally experiencing the bitter difficulties of a thousand dangers, when the Apocalypse was simmering down to an end, he collapsed; When he opened his eyes, he was reborn in a New World, 500 years after the end of the apocalypse, in the body of a student who had been dumped barely after graduation, who had been cheated of his hardwork barely after he started working…

The World of the Future, Virtual Idols PK Real Idols

“Every time background music plays in my head, I feel like there is nothing to be afraid of.” —Fang Zhao

Toward the end of the apocalyptic period, Fang Zhao lost his life. However, instead of dying, he found himself 500 years later in the body of a young and aspiring composer who shared the same name. Having received a second chance at life, Fang Zhao sets out to achieve the previous owner’s dreams.

Armed with the experience of living through an apocalyptic age and his profession as a composer before that period, Fang Zhao uses his talent, wits, and knowledge to make his mark in the entertainment industry of the future.

- Description from Novelupdates