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.
A relationship manhwa is basically a story that gives a lot of emphasis on how people interact and the bonds they form. It shows how characters' feelings and actions affect their relationships with others. These can range from sweet love stories to intense friendships or complicated family dramas.
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.