“I erased all of my emotions but I couldn't erase you.”

Set in the future, Joohyun is not an average human like anyone else - she is a guinea pig used for an experiment as a research. Despite of her human features, what differs her from everyone else is her electro heart and the lack of any emotion or feeling.

Taeyong is just a teenager that rebels against the new system of administration but doesn't get himself involved in any trouble, however; when he bumps into Joohyun, the human cyborg, he finds himself in a series of trouble.