At thirty-five, Ye Chen stood beside Liu Dan's hospital bed, holding her hand and regretting everything. In his previous life, he had been timid and insecure. He could only watch as Liu Dan, his childhood sweetheart and the girl he had always loved, was harassed by a spoiled rich kid, then got into a car accident and missed the college entrance exams. He didn't even have the courage to protect her. In the end, Liu Dan left for another city, and they became each other's lifelong regret. By a twist of fate, he was reborn in his senior year of high school. The cicadas still sang, Liu Dan still sat at the desk diagonally in front of him, and sunlight fell across her hair. This time, Ye Chen bonded with the Time Guardian Sign-in System. From secretly passing her candy in class and bringing her a special umbrella on rainy days, to using the System's resources to help her avoid danger and deliver face-slapping justice to villains, he turned every regret into a sweet, doting daily life. When the rich kid provoked him and the mistress tried to drive them apart, he never backed down. When the System warned him that Liu Dan was at risk of a car accident, he fought with everything he had to protect her. Even through the agonizing romance that followed the accident, he never let go of her hand. From high school to college, from campus to their wedding day, from just the two of them to a family of three, Ye Chen used the time he had gained by being reborn to make his beloved the wife he would cherish for a lifetime, fulfilling the love between childhood sweethearts across two lives.