One day I met a guy and he told me something.
At first I thought it was absurd and nonsensical, but soon I discovered that it could be realized on me even if the time, place and characters were changed; or it could be realized on someone else, either Zhang San or Li Si. I discovered that this can happen to each of us, and happens to everyone. So, I decided to find someone and use her to depict it. Then, it becomes "that day, that person, those things."