I Ran into My Secret Crush at the Class Reunion and Learned He'd Written Me a Love Letter

Maybe it was Xiao Rui's temporary escape that made him miss the love of his life. If he could go back in time, he would probably admit it. It was also Lu Xiao's actions that caused ripples in Cheng Ziyun's heart. If you missed it for a moment, you would miss it for the rest of your life. (Personal opinion, don't comment if you don't like it)

There will be regrets in life, but we are all well. Later, when we all grow up and understand, we feel relieved.