The drama follows an android named Nam Sin III, who must pose as the son of a wealthy family after the real Nam Sin falls into a coma.

Nam Sin's mother, O Ro Ra, a brilliant AI and brain tech expert, loses her son at a young age. In her grief, she creates an android identical to him to fill the void. Years later, when the real Nam Sin—heir to the powerful PK Group—is injured and left comatose, Nam Sin III steps in to take his place.