I'd suggest checking out dedicated manhwa forums or communities. Sometimes, fellow enthusiasts share links or recommendations on where to find specific manhwa like Spilled Blood. Just be cautious of illegal or unreliable sources.
Well, 'The Unholy' is purely fictional. It was crafted by the imagination of the writers and not inspired by any actual happenings. The story and its elements were made up for entertainment purposes.
In most cases, 'Unholy' is not rooted in real events. It's probably the product of the creator's imagination and creative process. There's no evidence suggesting it's based on actual happenings.