Her name is Changsheng, a girl who is a little bit crazy, a little bit crazy, with a simple mind and beautiful fantasy. She has a soothing temperament that no one else has, but beneath her calm appearance there is also a curious and restless heart. Finally, on the day after her fifteenth birthday, fate began to take pity on her. The sinister and dedicated Zheng Yuzhe, the arrogant and awkward Xia Chen, and the sunny Jun Xi were bound to each other. Where should she go? Everything starts in summer and ends in summer. She is immortal, she is Mo Changsheng, she is eternal. She finally grew up and finally became a wonderful, better girl.