Real estate agent Jung Tae's hobby is sneaking into strangers' homes and peeking into their lives. One day, a new face in the neighborhood catches his attention: Instagram star So Ra. Miraculously, So Ra leaves her house keys at Jung Tae’s real estate agency, and Jung Tae goes to her house whenever he can. Just like any other day, Jung Tae pays another visit and finds something he didn’t expect: So Ra’s body. Even worse, all the evidence points to Jung Tae as the culprit. Will he be able to find the real killer and clear his name?