In 2017, the delinquent Wu Si returned to his hometown to attend junior high school. In the loose campus atmosphere, he smoked and fought with his social friends, squandering his youth wantonly. At a sports meeting, he met Lu Zhixia from the key class for the first time. At that time, he thought she was too "pretentious" for crying and making noises, but he didn't know that the gears of fate had quietly turned.
A misunderstanding brought the two together, and Wu Si went from being initially disdainful to being moved by Lu Zhixia's tenderness and kindness, and then clumsily pursued her. After confirming the relationship, Lu Zhixia used love and expectation to prompt Wu Si to change. In order to enter the same high school as her, he worked hard to get rid of bad habits and his grades improved significantly.
However, Lu Zhixia's frequent nosebleeds without warning became a turning point in the relationship. She suddenly changed schools and broke up with her, leaving only "I don't like it". Many years later, Wu Si learned that she had passed away from leukemia. Those unanswered messages and unfulfilled promises became irreparable regrets.
Since then, Wu Si has been struggling with his longing and guilt for Lu Zhixia as he moved forward on his academic path, from repeating the college entrance examination to studying medicine. He tried to use actions to commemorate this first love that ended in vain. As the years passed, he could never forget that girl with a bright smile. Everything related to his youth had turned into the deepest regret in his heart, forever engraved in his life.