Warning
This fetcher was made following an issue request for it, i personally don't speak korean at all so i id it all while using the source-code and google translate to get website specific info. As a result, the fetcher might not be free of bugs and it will be hard for me to debug ths kind of issue as i'm not a korean reader. If you ever encounter some while using it, please report them so i can address the issue as soon as possible.
Naver comics is a popular korean website to consult and read webtoons. It devides the entries in 3 categories depending on the quality, Webtoon being the highest, followed by bestChallenge and finally Challenge. The more detailed explanation about the 3 different tiers can be found here: https://kubera.fandom.com/wiki/Naver
You normally should know this already if you use this site but just in case you can see in which category the webtoon belongs with the url of the webtoon, it is the second part of the url juste after https://comic.naver.com/ with either webtoon, bestChallenge or challenge.
To download the webtoon, just use the fetcher corresponding to the right category.
Note
The manga id is what follows titleId= and the chapter number what follows no=.
pyscandl.modules.fetchers.NaverWebtoon
pyscandl.modules.fetchers.NaverBestChallenge
pyscandl.modules.fetchers.NaverChallenge