There are three pairs of CPs in this article, all of them are protagonists, and of course they all know each other.
The emotional line revolves around the plot, but the main thing is to write about emotions.
Approximate word descriptions of three pairs of cp:
1: Space-time closed-loop encounter.
2: Concerns about falling in love at first sight.
3: Hindsight.
Concept: Love is something difficult to understand, and it cannot be understood by just one person.