Hwang Joo Eun and Ko Tae Hoon, who lost their six-year-old daughter Hee Soo in a car accident, live day by day, unable to escape the feeling of loss.
Tae Hoon, unable to watch Joo Eun breaking down, recreates their daughter Hee Soo in VR form at the suggestion of his friend Jun Beom, a program developer.
The family seem to find happiness again with the AI ‘Hee Soo.’ However, Joo Eun’s strong obsession with the AI gradually leads to catastrophe…