The play tells the story of a lonely woman who meets a perfect artificial intelligence (Holo) "One Person" who has only been looking at her and supporting her. It will tell the story of the process of growing up through the artificial intelligence Holo "One Person", from being alone and cold, to experiencing a heart-wrenching love and crying until his eyes are swollen. Yoon Hyun-min plays Gao Landu, who is the boss of an IT company and a genius developer. Almost all the projects launched by the company are developed by him. But only the official representative of the company knows his existence. Because of a large-scale hacking incident 10 years ago, he was chased and had no choice but to pretend to be "dead". Gao Shengxi plays Han Suyan, who is an agent of an eyewear company and is responsible for brand promotion and new store opening celebration parties. She is a professional woman who stands at the forefront of the industry trend. She is very considerate of customers at work and is careful and cautious, but in private she avoids other people's eyes and does not attend parties, looking very arrogant. This is because she has a fatal flaw of "face recognition disorder". It is directed by Lee Sang-yeop, director of "Mr. Back" and "Shopping King Louis", and written by Lee Yong-jae, screenwriter of "Liar Game".