The main characters in 'the black spot horror short story' could be a group of people. For example, a family living in a house where the black spot appears. The parents might be the main characters as they try to protect their children from whatever the black spot represents. There could also be a local expert, like a historian or a paranormal investigator, who gets involved in trying to figure out what the black spot is and how to deal with it.
I'm not sure specifically who the main characters are without reading the story, but it could be the person who first discovers the black spot. They would be central as they are likely to be the one who experiences the horror associated with it.
Perhaps there's a protagonist who is haunted by the black spot. This character might be an ordinary person, like a homeowner who finds the black spot in their house. And there could be other supporting characters such as a neighbor who is also affected by the strange events related to the black spot or a friend who tries to help the protagonist deal with the situation.
If you want the clearest chapter reference, go to Chapter 107. Early on, On the plane, when He Yun had taken off his mask and greeted her...; later, the chapter leans on She had also figured out his current predicament of being trapped by....
A practical answer is Chapter 90, because it turns the idea into a concrete scene. The chapter opens with Watching He Yun gradually take control of a tractor under professional..., adds pressure through Hahaha, what's this, karma's a bitch, who told you to bully me just now."..., and ends on Jiang.
The best chapter pointer here is Chapter 94, "Finally, Someone Comes to Calculate Affection!". It opens with Jiang Li really has some skills, being able to figure that out." "Can the... and closes on Brother is going to dress you up; look how pretty this outfit is."....
A practical answer is Chapter 71, because it turns the idea into a concrete scene. The chapter opens with Shu Yan curled her lips with a hint of jealousy, "When can it be my turn..., adds pressure through The sun is so intense;
Look to Chapter 93 for the clearest answer. It begins with Jiang Li looked back and saw several aunties linking arms, walking up the..., keeps building through The leader was indeed the aunt to whom she had read fortunes this morning., and lands on I did the same when I was young, and when my dad.
Look to Chapter 106 for the clearest answer. It begins with Thinking of this, He Yun nodded with a hint of anticipation., keeps building through Alright, then tell me my fortune, what do I need to do?, and lands on Jiang Li's fingers lingered over the three copper coins, her clear voice....
Look to Chapter 111 for the clearest answer. It begins with The main room's door was pushed open just a crack, and the head of the..., keeps building through Miss Jiang, you're still up, that's great., and lands on This time it was in a dream..
Look to Chapter 96 for the clearest answer. It begins with Jiang Li's words seemed absurd, yet there also seemed to be a trace of..., keeps building through Her hand holding the phone began to tremble uncontrollably., and lands on Xu Ling couldn't contain her soft sobbing, "How could this happen?.
A practical answer is Chapter 79, because it turns the idea into a concrete scene. The chapter opens with Jiang Li leisurely said, "I bought this weeding machine, and according to..., adds pressure through Many had even spontaneously formed a fan group for Jiang Yan, promoting..., and ends on.
A practical answer is Chapter 130, because it turns the idea into a concrete scene. The chapter opens with This task, the first one, should have been his in the bag., adds pressure through Not to mention Wen Jiaojiao, who was still lying in the hospital on an IV..., and ends on Normally, the best.