Its story might be what makes it unique. It could have a particular plotline that delves deeper into the emotions and relationships of the characters in a way that other BL graphic novels don't. For example, it might explore certain aspects of the characters' personalities more thoroughly or have a more complex relationship dynamic. Also, the cultural references or the setting it uses could be different from the common ones in the genre, which adds to its uniqueness.
One similar work could be 'Given'. It also has elements of BL (Boys' Love) and is presented in a graphic novel - like style with great art and an engaging story about the relationship between the characters.
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.
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.