The drama tells the story of Seo Ji-seong (Song Hae-yoon), who wants to fall in love but also wants to avoid the wrong person, and creates an AI refrigerator that is like the "ancestor god". The AI system she developed can distinguish between people who are like garbage, thus unfolding a romantic love comedy. Lee Jun-young plays the role of Jung Guk-seok, a firefighter who is the only person that the "ancestor god" cannot distinguish, and is a consistent man who does not use electronic media products.