She didn't know how anxious I was the moment she collapsed with a stomachache; he didn't know that I was almost bitten by a dog in order to find out where he lived; she didn't know that I was late on purpose on the day of high school registration, just to go to the same high school as her; he didn't know, I knew that he went to Shanghai, and deliberately chose a school across the river... Everything between us is like a circle, and we will always meet one day.