The story tells about the noisy and warm things in a reconstituted family. Yang Tingfeng (played by Hu Xianxu) and Yang Tingyu (played by Deng Enxi) are a pair of siblings. Since their mother Yang remarried Uncle Li, all kinds of embarrassing dramas have been staged in the reconstituted family. On this day, an uninvited guest Li Sheng (played by Zheng Wei) suddenly appeared, and the peaceful life was messed up... A second brother came from the sky? Parents are partial? The brother also turned against him? This series of drastic changes made Yang Tingyu unbearable, and he just wanted to shout: What should I do if the second brother comes!