Following

Entering the houses with the key entrusted to him by the clients, 'Koo Jung-tae', a real estate agent with a hobby of spying on other people’s lives. He becomes intrigued by SNS influencer 'Han Sora'. She posts a photo of a vegan salad while actually eating convenience store sausage, prompting him to begin spying on her closely. ‘Koo Jung-tae’, eventually sneaks into ‘Han Sora's house, discovers her lifeless body on the sofa. Soon after, he starts receiving threats from someone who knows he was there. As homicide detective 'Oh Young-joo's investigation closes in on him, ‘Koo Jung-tae' is compelled to search for the real culprit using clues from 'Han Sora's social media and the people around her.