The heroine Bai Boishui, who has the same elementary school, middle school and high school life, was confessed to by a handsome boy in the same class during her freshman year. Bai Boishui is a kind, simple, and idiot-like girl. She is independent on the outside but lonely on the inside. She was moved by the affectionate and rational words in the confession letter, and she agreed. They watched movies, hugged, kissed, quarreled, and took the CET-4 exam. She didn't know whether she liked him or not. She is like a drowning person who doesn't know how to fall in love or how to please people. A relationship that was full of troubles from the beginning finally broke down during the review week a month later. On the day after the exam, it rained. She held an umbrella and walked barefoot on the empty playground alone. She didn't know that falling out of love was so sad, and she didn't know that she was so weak. But so what, life still has to go on and people still have to grow up.