The plot revolves around a young woman who is searching for her suddenly disappeared boyfriend with the help of members of a UFO enthusiast club. Hong Ji Hyo is a girl from a wealthy family with connections that helped her land a decent job. She has been dating her boyfriend for 4 years. Although the feelings in their relationship have ceased to be as intense and passionate as they were in the beginning, the couple plans to get married. But then, the guy unexpectedly disappears under mysterious circumstances.