Well, it could be the characters in the 'the masterpiece scary story'. If they are strange, unpredictable, and have some dark secrets or motives, that would make the story really scary. For example, a character that seems normal at first but turns out to be a monster in disguise. Also, the plot twists can be a big factor. Just when you think you know what's going to happen, something completely unexpected occurs, like a sudden death or a revelation that changes everything you thought you knew about the story.
The writing style might play a crucial role in making 'the masterpiece scary story' scary. If the author uses vivid descriptions, especially when it comes to the gory or spooky details, it can easily make the readers feel frightened. For instance, detailed descriptions of a haunted house with creaking floors, cold drafts, and shadowy figures lurking in the corners can bring the horror to life in the reader's mind. The way the author builds suspense, slowly revealing bits and pieces of the horror, also keeps the readers on the edge of their seats.