After the unexpected death of his sister Yu Xue, 20-year-old Yu Chen discovered that his sister, who was always "in charge of everything", had always loved him deeply in a way that he had never noticed. On the day of the funeral, a car accident caused Yu Chen to be reborn with memories back to when he was 12 years old.
After rebirth, Yu Chen was determined to make up for the regrets of his previous life: he took the initiative to help Yu Xue with farm work, stopped her father from being cheated, took care of her all night when she had a fever, and even resolved the school bullying crisis in advance. The relationship between the siblings is getting closer and closer, but Yu Xue always shows a strange expression when the date of June 17th approaches.
When the fateful day finally came, Yu Chen tried his best to prevent Yu Xue from approaching the fatal river, but still watched her die trying to save a child who fell into the water. While sorting out the relics, he found the letter left by Yu Xue - it turned out that she was also a reborn person, and the person who died in the river in her previous life was Yu Chen. She came back with her memories and twice chose to trade her life for his.
