In middle school, Ah Zhi was cowardly and ignorant, while Jiu Mei was quiet and ordinary. During the summer vacation, he chased her and started a secret love. One night, he impulsively caused her to bleed, and she was diagnosed with leukemia. Under pressure, he was so scared that he left her and hid the relationship. Two years later, the girl bravely defeated the disease and became strong, and she also got a boyfriend who fought for her. The boy has been living alone and burdened with self-blame. The two met at a class reunion six years later, and he decided to embark on a journey to seek her forgiveness.