Kim Min-kyu (Yoo Seung-ho) lives an isolated life due to a severe allergy to other people. He develops extreme rashes that rapidly spread throughout his body once he makes any form of skin contact. Jo Ji-ah (Chae Soo-bin) is a woman who is trying to make it in life by creating her own businesses. However, after an encounter with Min-kyu, she ends up pretending to be a robot in place of the supposed AG-3 robot. The AG-3 robot was developed by Ji-ah’s ex-boyfriend, professor Hong Baek-hyun (Um Ki-joon) and his team. The robot was meant to be tested by genius Min-kyu, however an accident caused the robot’s battery to malfunction. As Baek-hyun modeled the robot after Ji-ah, the team ends up recruiting her to take the place of AG-3.