Source: Audience measurement performed nationwide by Nielsen Media Research. Original soundtrack My Secret Terrius OST

First script reading took place late June, 2018 at MBC Broadcasting Station in Sangam, South Korea.

Lee Yoo-young and Yoo In-na were offered the female lead role but declined.

Yoon Sang-hyun as Yoo Ji-sub (ep 17, 19 & 20).

Head of the national security at the Blue House.Ī nuclear physicist from North Korea, and Kim Bon's ex-girlfriend.

Mateusz Bąkowski (polish pianist, teacher music).

A woman with superb investigative skills. KIS agent Ĭhief of Kingcastle Information System (KIS). She is an ambitious, cold and calculating woman who hopes to take control of the agency, and who holds a secret about the conspiracy.Ī genius hacker who is rebellious.

Second-in-command and deputy director of the NIS. Head of the NIS who values patriotism, loyalty and camaraderie. Along with her neighbour Kim Bon ( So Ji-sub), who was an NIS agent, they discover the truth behind her husband's involvement in a huge conspiracy.Ī legendary black ops agent at the National Intelligence Service (NIS).Ī single mother who finds herself getting caught up in solving a conspiracy with Kim Bon.Ī former con man who holds the key to a mysterious incident that Go Ae-rin and Kim Bon are involved in.Ī NIS agent who is cold on the outside, but warm to Kim Bon, whom she has feelings for. Synopsis Ī woman named Go Ae-rin ( Jung In-sun) loses her husband. It was aired on MBC from September 27 to Novemon Wednesdays and Thursdays at 21:55 ( KST) time slot. When Ae Rin’s neighborhood friend accidentally stumbles on how Ae Rin’s husband appears to have been followed by a mysterious man, a suspicion of murder is raised.My Secret Terrius ( Korean: 내 뒤에 테리우스 RR: Nae Dwie Teriuseu) is a 2018 South Korean television series starring So Ji-sub, Jung In-sun, Son Ho-jun and Im Se-mi. Discovering the familiar hit-man is after Ae Rin and her family, he volunteers to watch over the twins while she is working for his ulterior motive of deciphering the puzzle he has been solving. With her situation, Ae Rin willingly obliges but falls into the problem of getting a sitter for her children.

Upon knowing that she is the wife of the witness whom his hired assassin killed, he reverses his initial decision and accepts her as his secretary.

When Ae Rin’s husband unfortunately witnessed a murder which caused the latter’s death, her family became a casualty to Young Tae’s evil ploy. In his solitary living, he works on a cryptic scenario hinting what happened to him three years ago. Unbeknownst to her, the quiet neighbor whom she shares the same floor space is a former NIS agent, Terius/Kim Bon (So Ji Sub), who has been living off-grid after a mishap that caused the death of his lover and compromised his job.

Terius behind me