Are You Human?

The drama tells of an android called Nam Sin III, who must pretend to be the son of a rich family when the real Nam Sin falls into a coma. Nam Sin's mother, O Ro Ra, is a genius at brain technology and artificial intelligence (AI), so when her son, the real Nam Sin, is taken away from her at a young age, in her grief, she creates an android that looks exactly like her son and has it grow up in place of Nam Sin. But when Nam Sin, who is a third-generation heir to the PK group, gets in an accident and becomes comatose, the android Nam Sin III must learn how to take his place. (Source: AJ at MyDramaList)