A love here one day is gone the next. Iris Young's boyfriend, Choi Minho, is missing. Fearing the worst, she travels to Seoul in search of answers as to where he could be. In her search, she befriends a kind local cafe owner, Taemin, a strong-minded hacker, Kibum, and an attentive junior detective, Jinki, who form an unlikely team to track down Minho's whereabouts. But as she inches closer to the truth, Iris must decide if there is such thing as a good in good-bye.