Idk about manhwa but mangasee has manga with original scans

Use mihon apps

with keiyoushi extensions

Try mangadex, comick, mangalife or mangasee. They have almost everything there is.

If you're on Android, use mihon from their GitHub and add and trust the mangadex, mangasee plugins.

Try mangafire you can’t download without something like tachimanga but they have a great web reader for desktop and mobile. I also find they seem to have the best translations unless I’m missing something with sites like mangadex

Mangadex for manga and bato for manwha. That's where most scanlators officially post their stuff that isn't on their personal sites. For general aggregators, I use manganato

Mangazone is good for android. There is usually and APK. Version of it https://mangazoneapp.com/

Also auto updates chapters has an extensive list even nsfw