The only no-romance manwha I can think off is Hello! Veterinarian!
https://www.mangago.zone/read-manga/hello_veterinarian/
https://www.mangaupdates.com/series?type=Manhwa&perpage=50&exclude_genre=Romance&orderby=rating
From the top-rated, I read and can fully recommend Noblesse, it's completed.
Then from the ongoing ones:
The Greatest Estate Developer,
The Knight Only Lives Today
and Eleceed.
Tower Of God was also very good, but it had a long hiatus between seasons, so I'm waiting for it to end to re-read it, so I can't vouch for the newer seasons ;)
https://www.mangago.zone/read-manga/living_as_the_enemy_prince_sellascans/
https://www.mangago.zone/read-manga/true_education/
https://www.mangago.zone/read-manga/myst_might_mayhem/
https://www.mangago.zone/read-manga/the_suspicious_boy_is_one_of_the_world_s_top_ten_masters/
https://www.mangago.zone/read-manga/return_of_the_flowery_mountain_sect/
https://www.mangago.zone/read-manga/killer_pedro/
https://www.mangago.zone/read-manga/the_crown_prince_that_sells_medicine/
https://www.mangago.zone/read-manga/hello_griffin_the_fluffy_bird/
i want good manhwas that have absolutely NO romance idc if its shounen mystery horror whatever i just need it have no romance plspslslslsl... i rlly like shounrn manhwas too but ive never read one before