One option could be to search on popular manga and manhwa aggregator sites. Sometimes, they have raw versions available. However, make sure you have the right permissions and are not violating any copyright laws.
Well, manhwa is Korean comics and corn is a type of crop. There's really no obvious relationship between the two. Maybe in some very specific and rare context there could be, but generally speaking, they're completely different things.
Manhwa and hen? There's no typical or common relationship between them. Manhwa is about visual storytelling and hen is an animal. It's hard to imagine how they could be related in any meaningful way.