The reason it's called manhwa is because it's the traditional and specific name for comics coming from Korea. It helps identify and categorize these comics within the global comic landscape and gives them a unique identity.
One reason could be to comply with certain legal or moral standards. Maybe the content is considered too violent, sexual, or otherwise inappropriate for the general audience.
The 'Why Not Me' manhwa is popular for several reasons. Firstly, the art style is visually appealing. Secondly, the themes explored resonate with many readers. Finally, the character growth and relationships are portrayed realistically.