Frozen (and its sequel) are just super popular in Korea. Regarding the fanfic, it's been translated to Korean, Chinese, and Russian, with the Korean version being completely translated here: https://m.blog.naver.com/lsh4710711/220067484269
There are a lot of comments on the Korean translation, so I'm assuming it's one of the most well-known Frozen fanfics in Korea.
Well i wouldn’t say goth but i do think the Design overall is pretty pleasing to the eye and fashion wise~ it fits very well with Marnie, so it’s bound to fit others as well, and you tend to like it more when you find something interesting so :)