From a legal standpoint, downloading copyrighted material for personal archiving occupies a legal gray area in some regions, but distributing downloaded files publicly is a severe violation of copyright law. Always support authors by purchasing premium chapters officially before attempting any form of offline saving. Security Risks
What do you plan to use? (Windows, Mac, Android, iOS) Novelpia Downloader
By using a downloader that scrapes the site, you are likely violating these terms, which could result in your account being suspended or terminated. From a legal standpoint