A scientist buried in his work to avoid the pain of his wife's death, he brings a robot home which looks just like his wife. The robot carries the burden of making her two  daughters "happy". Tzu-Yu, a scientific girl who inherited her father's talent. She has  not only to face the huge changes caused by her robot mother, but also the pressure  of the competition. Moreover, the romance between her and the gifted transfer  student Yi-Hsiu, making her sip the sweet and sour taste of growing up.