Realtor Jung Tae’s hobby is sneaking into strangers’ homes and peeping into their lives. One day, an unfamiliar face in the area grabs his attention-an Instagram star, So Ra. Miraculously, So Ra leaves her house key at Jung Tae’s agency, and Jung Tae visits her home whenever he can, thrilled and excited. Like any other day, Jung Tae makes another visit and finds what he hadn’t expected: the dead body of So Ra. Even worse, all evidences say that Jung Tae is the criminal. Can he find the real killer and clear his name?