Realtor Jung-tae(BYUN Yo-han)’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(SHIN Hae-sun). 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?