The scheming little brother VS the awkward little childhood sweetheart is the daily "mutual quarrel" between childhood sweethearts, and it is also a two-way secret love that is duplicitous! When Pei Jinjin came to his new home, the person he hated the most was Pei Xiao. She's pretty, but her grades always get the upper hand, and she doesn't care about this or that. A whole ten years, from the age of eight to eighteen. From the age of ignorance to the early growth of teenagers and girls, whether it is interesting or boring childhood life, or every moment of joy or sadness, they are always together. When she was scared, he was the first person she thought of. Obviously, "be good." She had heard him say it many times since she was a child - but why did she slowly start to blush and feel her heart beat hot and her palms feel hot. But what she didn't know was: Pei Xiao's attitude toward Pei Jinjin was Xu Xu Tuzhi.