A young heir falls into a coma after being brutally assaulted. However, his mother is determined to keep him in the race for the family fortune and creates a robot to replace him.

Nam Shin is a son from a family who runs a large company. After an unexpected accident, he falls into a coma. His mother Oh Ro Ra is an authority on brain science and artificial intelligence. She creates an android named Nam Shin III which looks like just like her son Nam Shin. The android pretends to be Nam Shin and he has a bodyguard called Kang So Bong.

Robot Nam sin falls in love with Kang so Bang and she will eventually start feeling and love for. After some time Human sin starts to regain his consciousness his mother thinks to activate kill switch to end Robot Nam sin life but another person David tries to make her change her decision to handover him to his control he will look after and in between David is involved with Sin grandfather chairman who is cunning and who knows everything about human and robot sin and pretend like nothing happened and he is the sponsorer for the development of robot sin. Still continues.