"My Secret Terrius" is a South Korean television series that aired in 2018. The story follows a former intelligence agent named Kim Bon, who becomes embroiled in a mysterious case involving his neighbor, a single mother named Go Ae-rin. As they work together to uncover secrets, they face various challenges and dangers. The show combines elements of romance, comedy, and thriller, making it appealing to a wide audience. It features a talented cast, including So Ji-sub as Kim Bon and Song Ji-hyo as Go Ae-rin, and has received positive reviews for its engaging plot and character development.