Go Ae Rin suddenly loses her husband. A mysterious man, Kim Bon, lives next door. Kim Bon is a legendary NIS agent. He helps Ae Rin uncover a conspiracy, which husband became involved with.Go Ae Rin suddenly loses her husband. A mysterious man, Kim Bon, lives next door. Kim Bon is a legendary NIS agent. He helps Ae Rin uncover a conspiracy, which husband became involved with.Go Ae Rin suddenly loses her husband. A mysterious man, Kim Bon, lives next door. Kim Bon is a legendary NIS agent. He helps Ae Rin uncover a conspiracy, which husband became involved with.