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.
Oh Ro Ra, a robotics expert, creates an AI robot replica of her lost son, Nam Shin. Meanwhile, the real Nam Shin flees to the Czech Republic.
Ji Yeong-hoon goes to the Czech Republic to find Nam Shin. However, he find him in a coma, along with his mother Oh Ro Ra and Nam Shin III.
Ji Yeong-hoon and Oh Ro Ra try to keep Nam Shin III's identity a secret. However, Seo Jong-gil notices that something is off.
Kang So-bong follows Yeong-hoon in order to find out his and Nam Shin III's secret. However, Nam Shin III works to avert this crisis.
So-bong is shocked to discover Nam Shin III's secret. Ji Yeong-hoon and Oh Ro Ra then plead with him to keep the revelation to himself.
As a refusal to marry Yena, Shin III kisses So-bong. However, despite opposition, Yena moves out of the house to show her will to marry Nam Shin.
Jong-gil reveals Chairman Nam's dementia in front of the company's executives. Meanwhile, Yena sees something strange on Nam Shin III.
Nam Shin III acts unexpectedly as his and Yena's wedding plan moves ahead. Meanwhile, the human Nam Shin is in critical condition.
So-bong and Yeong-hoon struggle to think of Nam Shin III as just a machine. Meanwhile, Nam Shin III takes a stand against Oh Ro Ra.
Sensing that So-bong is in danger, Nam Shin III runs out of the wedding to save her. Yena hears a conversation between Jong-gil and Secretary Park.
Oh Ro Ra asks So-bong to keep Nam Shin III's kill switch a secret. She later learns that human Nam Shin is showing signs of recovering from his coma.
Nam Shin reunites with Ro Ra but doesn't react well to Nam Shin III. Meanwhile, So-bong is in love with Nam Shin III and tries to protect him.
Nam Shin gets angry after learning Ro Ra's true feelings for Nam Shin III. Meanwhile, Chairman Nam decides to make Nam Shin III take over the company.
Nam Shin III sees symptoms of dementia in Chairman Nam. Meanwhile, threatened by Nam Shin III's presence, Nam Shin pushes ahead with going to work.
Nam Shin goes on a date with So-bong while pretending to be Nam Shin III. Later, Nam Shin pressures Ro Ra to let him manually control Nam Shin III.
Nam Shin III's feelings for So-bong help him override his manual mode. Meanwhile, Nam Shin sets out to take control of the company from Chairman Nam.
So-bong prepares a surprise birthday party for Nam Shin III. However, Nam Shin secretly takes Nam Shin III's kill switch and calls him out.
Nam Shin III goes on the run after getting framed for Ro Ra's murder. Nam Shin is devastated by Ro Ra's death and Yena becomes suspicious of Jong-gil.
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