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.
Typically, 'blood link korean manhwa fanfic' might inherit the unique art style and story - telling elements from the original manhwa. It could have complex characters and a plot that revolves around themes like family bonds (linked to 'blood' perhaps), power struggles, and love. The fanfic might also incorporate korean cultural elements that are prominent in the original manhwa.