A school comedy inspired by the two-child policy in China that revolves around a brother and sister and their daily encounters. Shi Fen (Joseph Zeng) and Shi Miao (Sun Qian) are siblings like any other. Shi Fen, the older brother, may be utterly unreliable at times, but he cherishes his sister a lot. Shi Miao, the younger sister, may be violent and abusive towards her brother, but she is extremely attached to him. Together with classmates like Zhen Kaixin (Wang Xudong), Wan Sui (Hu Yongtao), Wan Xing (Ma Boquan) and Miao Miao (Lu Xiaoyu), the two encounter hilarious situations in school.