This is not a fairy tale. This is about real witches.
Grandmamma loves to tell about witches. Real witches are the most dangerous of all living creatures on earth. There's nothing they hate so much as children, and they work all kinds of terrifying spells to get rid of them. Her grandson listens closely to Grandmamma's stories—but nothing can prepare him for the day he comes face-to-face with The Grand High Witch herself!
(Source: Amazon)
This is the Korean translation of The witches, by Roald Dahl. If you've already read it, it might help with understanding (that was my intention at first, but then I realized that I'd forgotten mostly everything). Besides that, the story is quite enjoyable, a classic Roald Dahl novel, so there's always something interesting happening.
What I really enjoyed though is the language level. I won't say that grammar is easy, but even if sentences can get quite long, the use of the grammar is still mostly straightforward. Vocabulary has a larger range, but what's nice is that most of the less common vocabulary is introduced in chunks, in the first hundred pages of the book. All of this vocabulary describing the witches and from the meeting room is used and reused throughout multiple chapters in the book. This ended up showing strongly in my reading speed, at first I was reading pretty slowly (0.2-0.3 pages/minute) because I needed to look up a lot more vocab and in the end I was hovering closer to the 0.6-0.9 pages/minute range.
As a nice bonus, most chapters are also rather short, usually ~5-15 pages, up to ~20 pages at most. So that means that you can split your reading into lots of small reading sessions, simply by reading one chapter at a time. In fact, there are actually 22 chapters, for 282 pages total. It's a long book to read if you're not used to more long form content, but it's also a nice way to start reading longer books.