Hardcore Levelling Warrior is pretty good series it has a sequel. MangaDex isn't listing the full complete English chapters. You can find it somewhere on the net, somehow.
This is a manga about the karate girl who goes to the mainland to teach karate as an idol but gets roped into degen rich people sex shit and learns about the dark side of the entertainment industry https://mangadex.org/title/b6116025-1a94-4f32-9c9b-aa341f3950f0
https://forums.mangadex.org/threads/how-to-exclude-original-language.1608927