High-end AI robot Bo accidentally loses her way while she is being shipped from the factory. She eventually ends up among a family of weirdos in the realm of human beings. AI company employee Koo Ka-lim thinks he has found some treasure and arbitrarily keeps Bo for himself. To help four family members in the Koo household handle all kinds of strange tasks, Bo switches on her self-learning function and begins to experience myriad human emotions and desires. She even has a crush on her master Ka-lim and understands the meaning of love. Top management member and also romantic rival Sister Dorian keeps going after Bo at all times as she is determined to eradicate her. Meanwhile, Bo detects some computer bug has hit her. Her life is coming to an end.