From the perspective of a bystander, I write down the little things that happened between Yi San and Yao Yao, their senior classmates, just as a moderator for the two of them under the pressure of their senior year. I hope that in the future, we will recall that our senior year was not just about swimming in the sea of topics. This article has pitfalls, big pitfalls, special pitfalls, very pitfalls, and all kinds of pitfalls.