Any action manhwa/manga with female mc? Or male mc is fine but with no unnecessary harem?...

https://www.mangago.me/read-manga/omniscient_reader_s_viewpoint/
https://www.mangago.me/read-manga/white_blood/
https://www.mangago.me/read-manga/purple_hyacinth/
https://www.mangago.me/read-manga/the_s_classes_that_i_raised/

Same mangaka who did bleach! I really like his female characters: https://www.mangago.me/read-manga/burn_the_witch/

The witch and the beast maybe worth your time, check it out! Love thay manga

Ok on second thought, rereading this and I did not remember how much sexual harassment it had. Ugh. This one is a seinen with a really badass femc: https://www.mangago.me/read-manga/raise_wa_tanin_ga_ii/