A name "Chen Mo" suddenly broke into the birthday party, tearing a gap in Su Xiaotang's memory - the last half of the senior year of high school disappeared out of thin air, leaving only the pain of breaking up with Lin Wanxing. As clues from encrypted videos, old paintings, and diaries emerge, the plight of the transfer student Chen Mo, the unexpected rumors, and the help secretly planned by the five people gradually become clear. From the old locust tree on the high school campus to the watch outside the operating room many years later, the reunion at the art exhibition, and the blessing at the wedding, the six partners spent ten years proving that the regrets of youth will be filled with friendship, and those days spent together will always be the most precious old diary in the heart.
