On the first day of transferring school, Su Nian knocked over the white shirt of the top student Jiang Yan in the corridor, but he grabbed his wrist and said, "Finally I found you." The whole school thought he was trying to strike up a conversation, but only Su Nian knew - the brother next door who had agreed to "enter the best university together" seven years ago disappeared and then suddenly appeared, becoming someone she had no memory of. Jiang Yan handed over a yellowed exercise book with the title page reading "To my future self: The coordinates have been locked, please approach as planned." After that, the rooftop tutoring became a two-person session, anonymous love letters were stuffed into her desk every day, and he read her name in front of the whole school broadcast during sports games. When Su Nian finally wanted to respond, the last line of the exercise book made her shiver: "If you see here - one of us is going backwards in time." The sweet two-way rush hides the secret of time and space spanning seven years. Every "accidental encounter" is carefully calculated, and every "good night" is a rush in the opposite direction. It turns out that the so-called destiny is that someone will love you as before in the countdown.
