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When 10-year-old Ning Shihui didn't know how to like her, she had a crush on a handsome brother who played the piano next door. However, her neighbors regarded her as a child who was ignorant and acted on a whim. The angry Ning Shihui was determined to prove it to these adults, so she and her good friend Shen Chong planned a bunch of "confession plans." After the "Confession Plan" failed, Shen Chong, in order to comfort Ning Shihui, promised to marry her if she was not married in ten years. It was originally a child's talk, but it later involved them for such a long time. Later, the boy was heartbroken, but the girl could no longer feel the pain...