Because of an impulse in adolescence, Cheng Jia confessed to Gu Xiao, who was one year older than her. If Cheng Jia knew that that confession would have such a big impact on the two of them in the future, then she would rather not have that impulse.
But for Gu Xiao, if he had known that Cheng Jia was so important to him, he would not have wasted so many years between the two of them, and would always regret it in the future.
For a while, there was a popular proposition on the Internet: Imagine that you are sitting on the beach chatting with the person you have let go of, and you are chatting as if you just met. He suddenly came closer and blinked at you and said, "Can you love me again." When Cheng Jia brushed it, he really stopped and thought about it seriously. If Gu Xiao had asked him to be his girlfriend later, would she have refused and would she have told him that everything was over? So the two people just missed each other.
Intention: Cherish the present