Synopsis Korean Drama Terius Behind Me

Go Ae Rin is a single mother who, after she unexpectedly lost her husband, is involved in a spying war. She lives in the apartment in front of Kim Bon. Kim Bon, whose code name is Terius, is a legendary Black Ops agent for the National Intelligence Service (NIS) who hid after disappearing without a trace. Three years ago, in a failed secret operation, he lost the woman he loved. Since then, Kim Bon has been hiding in his apartment with Go Ae Rin, isolated from the world around him and living in secret to uncover the mystery behind what happened then. When a mysterious incident occurs, in which Go Ae Rin's husband dies, the two team up to uncover a huge plot involving Go Ae Rin's husband.
Joining them is Jin Young Tae, a former cheater who can hold the key to what Go Ae Rin and Kim Bon are looking for, and Yoo Ji Yeon, another NIS agent who looks cold and unfeeling, but feelings to Kim Bon, whom she is friendly.

(Source: AJ at MyDramaList)

Native titles: 내 뒤에 테리우스
Also known as: Nae Dwie Teriwooseu, My Secret Terius, My Secret Terrius, Nae Dwie Teriuseu
Writers: Oh, Ji Young
directors: Park Sang Hoon
Genres: Suspense, friendship, thriller, mystery, comedy, crime, political
keywords: Attempted murder, Socially unpleasant protagonist, Car accident, Community work Female leash, Funny Second Lead, Kind mother, Fake identity, Funny Female Lead, Light romance