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.