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The unexpected reunion between Mr. R and Miss W seemed unintentional, but it was his advance arrangement. Breaking through all boundaries, he is no longer her, and she becomes him again... Their reunion is destined to bring disaster to those around them. Will this carefully arranged love finally break through the boundaries of gender?

In the late summer of 2015, Lin Mo, a freshman in high school, found an anonymous letter in her desk and became involved in the mysterious disappearance of her classmate Su Xiao. Twenty years later, when she became a reporter, she dug out three time-spanning letters under an old locust tree because she was reporting on the demolition of the old school building. The letters contained the secrets of math teacher Zhang Cheng, the lies of classmate Chen Yang, and the proof that Su Xiao had never left. When the white shirts and gardenias in her youthful memories are intertwined with the conspiracies of the adult world, she must piece together the truth about what was not sent that summer before the countdown to demolition...