Chu Hong met Cheng Qin, her math teacher, in high school. When she first saw this serious-looking teacher, Chu Hong didn't think there was any difference. He was just another teacher in high school. After high school, Chu Hong went to college, far, far away from high school and far, far away from Cheng Qin. Chu Hong once thought that as she matured and grew up, she would eventually forget Cheng Qin and everything would end. Unfortunately, it backfired.
Intention: There are many feelings that we shouldn't have, but it's too late to express them.