At thirty-eight, Lin Yusen is on the brink of death after a car accident when he returns to a rainy day at eighteen. Su Wan, the girl who crashed into his youth, is crouched on the ground, picking up scattered English test papers.
In his previous life, they fell in love in high school, struggled through a long-distance relationship, and finally went their separate ways in their seventh year together. Su Wan married and moved far away, while Lin Yusen was crushed by life's burdens and his parents' illnesses. Reborn with regrets, he deliberately keeps his distance, hoping to avoid the bitter end fate has in store. But when she carries him to the infirmary and hands him her notebook of corrected mistakes, her kindness makes him fall for her all over again. Through a twist of fate, they both get into the same university in Beijing. The library in the morning light, the evening breeze on the sports field, and holding hands on New Year's Eve make him believe he can rewrite their ending.
But reality is hard to escape. Su Wan's father falls seriously ill, and the tests of a long-distance relationship and the weight of responsibility still drive them down different paths. This time, Lin Yusen watches Su Wan in her wedding dress and personally gives her away to the groom. At the wedding, tipsy, he finally lets go. When he wakes up in the ICU, he understands at last that being reborn was never about keeping someone by his side. It was about making peace with regret and saying goodbye to the person he used to be.
Those youthful flutters and missed chances eventually become sighs carried on the evening breeze. Some encounters are meant to be remembered.