My Secret Terrius (Korean: 내 뒤에 테리우스; RR: Nae Dwie Teriwooseu; lit. Terius Behind Me) is a 2018 South Korean television series starring So Ji-sub, Jung In-sun, Son Ho-jun and Im Se-mi.
It was aired on MBC from September 27 to November 15, 2018 on Wednesdays and Thursdays at 21:55 (KST) time slot
Go Ae Rin (Jung In Sun) is a single mother who, after unexpectedly losing her husband, finds herself involved in the crossfire between spies. She lives in the apartment opposite Kim Bon (So Ji Sub), code-named Terrius.
Kim Bon is a legendary black-ops agent with the National Intelligence Service (NIS), who has kept himself hidden after a failed mission, which resulted in the death of a loved one.
They join forces to uncover the big conspiracy, to which Go Ae Rin’s husband was witness, and that cost him his life. Alongside them is Jin Yong Tae (Son Ho Joon), a former con man who may hold the key to the conspiracy, and Yoo Ji Yun (Im Se Mi), a fellow NIS agent who seems cold and insensitive on the outside, but harbors deeper feelings for Kim Bon.
Also known as Code Name: Terrius
Terius Behind Me
Hangul 내 뒤에 테리우스
Created by Kang Dae-sun
Written by Oh Ji-young
Directed by Park Sang-hun