Why japanese mangas usually in black and white? Why not they be like the Korean mangas?

is this your first time reading a manga? Well, to answer your question,, it's because the printing is cheaper that way

its because, usually, mostly mangas have physical copies (i think i spelt wrong but idkk) so its much more cheaper to print a bunch of b&w pages than colored ones

in the other hand, manhwas are not comercialized that much in physical copies when compared to mangas so thats why