Webtoon does have a few 18+ comics. However, their availability can vary depending on your region and the platform's content regulations. Some might be hidden behind age verification or specific access settings.
I'm not entirely sure as I haven't read it specifically. But generally, a light novel might be about the story of a 'Secret Lady', perhaps her adventures, her hidden identity, or her relationships in a fictional world.
Love is likely to be a main theme. Often in such novels, the relationships between characters, especially the romantic ones, are central. Another could be secrecy itself, as the title implies that there are secrets held by the lady in the story.
No, webtoon and manhwa are not exactly the same. Webtoons can come from various countries and have diverse styles, while manhwa specifically refers to Korean comics.
No, they're not the same. Manhwa is a general term for Korean comics. Webtoons, on the other hand, are a specific type of digital comic format that originated in South Korea and are usually designed for online reading with a vertical scroll.