Recommendations OP MC Novels That aren't Harem

The title said it all. I'm looking for some Korean/Chinese novels that have OP MC or ML that does not have Harem. It could be BL. Actually, please make it BL if possible. If not that's fine too. I am currently looking for motivation to read while I write my own novels. So, please helps!

Thanks in advance for the help!

 

Omniscient Reader’s Viewpoint?
Non-romance/ BL but fans are shipping the MCs because of their “BFF type” of interactions.

 

The Legendary Mechanic
The MC is kinda OP and he doesn't have any interest in romantic relationships. Not BL.

 

Thank you @Maomaomao and @dreannhirt for the recommendation.

 

OP MC kingdom building, no harem or bl though
https://www.webnovel.com/book/16129893106084105/Rise-of-the-Legendary-Emperor

 

Thanks !