The idea for the story came from when I was on the way to school, recalling the need for high-speed rail in my hometown, and thinking about the story of meeting an acquaintance on the high-speed rail. After putting down the luggage, when I looked up again, I saw a very familiar smiling face and said "Long time no see". This is the beginning of this story.
I wanted to write a special story before. If the protagonists had never met before, it would be like living in two different planes. They are like two parallel lines that may intersect at infinite distance. They are similar, but have never officially met. Like all passers-by, they just pass each other in a hurry. They understand each other and are close friends, but they live on different planes. I call it "Linear Geometry".
Intention: Meeting is fate