Maybe it's the unexpected twists. In a horror story, when things suddenly change in a way you never saw coming, it can be really terrifying. For example, a seemingly friendly character turns out to be the source of all the evil.
By creating complex characters. If the characters have their own backstories and motives, it makes the story more interesting. For instance, a character haunted by their past actions is more engaging.
Once upon a time, in a small, isolated village, there was a mysterious old house on the outskirts. People said that at midnight, strange moans could be heard from it. One brave young man decided to explore. As he entered, the door slammed shut behind him. The air was freezing. He saw shadowy figures moving in the corners. Terrified, he ran but found himself lost in the endless corridors. Finally, he fainted. When he woke up, he was outside the house, with no memory of how he got out, but a lingering fear in his heart.
The unknown. In a mor horror story, when there are elements that are not clearly explained, it creates a sense of unease. For example, a strange noise in the dark that has no obvious source. It makes our imagination run wild, and that's what scares us.
It's not based on a real story. 'Wanting Mor' is likely the product of the author's imagination and creative writing process. There are no real-life counterparts or events that it's directly tied to.
There's no way to tell just from the name that it's a horror story. 'Dear David' might be a name in a very normal, non - horror - related real - life story. Maybe it's a story about a family member or friend named David, and it could be about love, friendship, or an adventure they had together, not horror at all.
I'm not sure. Just because it's based on a true story doesn't mean it's a horror story. It could be a heartwarming tale about friendship with David or a story of personal growth.