In time, there are always some lingering regrets. At the beginning of the story, no one could predict the ending. Fortunately or unfortunately, it is like quicksand in the hand, which cannot be grasped or retained. You always think that everything will become calm as time goes by, but it always shows up in front of you so clearly when it shouldn't appear, making your heart unable to calm down for a long time. Memories that occasionally pop up will cause ripples in your peaceful life, blurring your eyes and making your heart feel bitter. This is youth.