It might be that the nature of the wishes themselves is unrealistic or against the established logic of the manhwa's world. Or perhaps it's part of a greater lesson or theme the story is trying to convey.
Definitely not. Manhwa comes from Korea. It has unique features that set it apart from Chinese comic works in terms of art style, storylines, and cultural influences.
Sure is. Manhwa specifically refers to comics created in Korea and has its own unique style and characteristics compared to comics from other countries.
Onepunchman is definitely not a manhwa. It's a Japanese manga that features an interesting plot and distinctive characters. The manga has been adapted into various forms of media.