Under the romantic cherry blossom tree, the boy and the girl held hands and made a happy promise: "We will be together in life and death, and we will never leave."
But one day, the boy suddenly left. However, he did not tell the girl because he was afraid that she would be sad. . .
Ten years later, the two met again. The boy recognized the girl, but the girl did not. Instead, she silently fell in love with Cheng Hao, a senior who was one level older than her. From then on, time began to flow backwards...