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Girl Jiuyue and her childhood sweetheart Chi Mu grew up together. Girl Jiuyue is a person who does everything carelessly. Chi Mu is silently guarding her behind. He thought that such days can last for a long time, for a lifetime, and for the next life... But he forgot that his mission is to wait for the arrival of another him. "September, are we finally going to say goodbye?" Looking at the gradually disappearing twilight, September screamed "No!" ...

The girl who had just begun to fall in love unknowingly fell in love with the boy next door. She didn't know how to express her feelings, so she asked her best friend to help, but the two eventually grew further and further apart. A few years later, the girl recalled that boy became the best memory of her youth.