Supreme Casanova: Ultimate Harem System - Chapter 36: Devilish Muscle Unlock Pills.

Li Zhao is a poor, 20-year-old actor who only thinks of where his next meal is coming from. After growing up in a child only facility, Li Zhao has taken on a very optimistic personality even while raising money for those he sees as family.

By accident, Lu Zhiyu found the entrance to a low-dimensional world, and thus began a totally different journey!

To pass as an imperial concubine, one must be professional.

Actually, the profession of an imperial concubine is pretty good. The emperor will accompany you in eating and drinking, and even pay you for it. What’s not good about that?

- Description from Novelupdates

Xiao Ran transmigrated to a fantasy world. As a dungeon guard in the Celestial Dungeon, with a special floor called the Purgatory meant for powerful demons and martial arts experts, he faced a huge challenge from the start. The Eldest Princess acquired a forbidden martial arts technique and was banished to the Purgatory. However, no one was powerful enough to restrain her. All the dungeon guards were defeated. Xiao Ran stepped up and declared, “Your Highness, it’s better for you to behave yourself on my territory” and effortlessly subdued the Eldest Princess.

He progressed from imprisoning the Eldest Princess to delivering the Great Xia Kingdom from the evil clutches of various demons and evil martial arts experts.

…

Xiao Ran was the mastermind behind the scenes.