There are many people, some are just passers-by, while others are stopping in your world. When they didn't meet, they lived their own lives, but once they met, they stayed together forever.
Human life is so long, Xi Muyao couldn't imagine how bleak the rest of his life would be without Gu Nan'an.
Recalling that year, he said "Hello, teacher" and from then on this person lived in Xi Muyao's heart forever. From high school to college, it seems like a coincidence, but in fact it is his careful arrangement. Originally, they just wanted to work together for a lifetime, but unexpectedly, they hurt her the most.
In the years since you were gone, this is the story of two people, but the memories of one person.