Gao Xiaoyi (played by Wang Bo) and his father (played by Xue Tao) lived a life of dependence on each other. One day, his father suddenly announced that he was going to remarry, so he went on a honeymoon with his new wife, leaving a bunch of messes in the company to Gao Xiaoyi to deal with. Not only that, Gao Xiaoyi also inexplicably had a non-blood-related sister Tong Xiaoqing (played by Zhang Na). In this way, Gao Xiaoyi and Tong Xiaoqing began their cohabitation life. In school, Tong Xiaoqing is a well-known school beauty with excellent character and academic performance, but as soon as she returns home, Tong Xiaoqing will instantly take off the mask of an excellent student and turn back into the carefree and informal little girl who enjoys bullying her brother. Gao Xiaoyi has always liked a girl named Tian Xiao (played by Gong Qi), and the appearance of Tong Xiaoqing makes Gao Xiaoyi's secret love even more full of twists and turns.