Ace NIS agent Jung Hae-seong is demoted after a mission failure. He goes undercover at a high school to locate King Gojong's missing gold, meeting his teacher Oh Soo-ah, who sees him as her lost first love, stirring old heartbreak.
Seo Kang-joon
Jeong Hae-sung
Jin Ki-joo
Oh Su-ah
Kim Shin-rock
Seo Myung-ju
Kim Min-ju
Lee Ye-na
Yoon Ga-i
Park Mi-jung
Kim Young-ah
Im Chung-ha
Lee Hyun So
Han Seung-jae
Yun Chae-bin
Yun Chae-rin
Kim Sun-min
Ji Hyeon-jun
Choi Jeong-in
Director
Im Young-bin
Writer
May 5, 2015
Jan 17, 2023
Oct 9, 2024
May 20, 2019
Aug 5, 2019
Feb 26, 2020
Mar 17, 2021
Nov 8, 2023
Apr 21, 2017
Jan 13, 1997
Jul 15, 2009
Jun 16, 2022
Apr 9, 2021
Sep 21, 2016
Feb 3, 2022
Jul 25, 2025
MBC
South Korea
한국어/조선말
![[1차티저] 국정원 요원 서강준, 고등학교에 잠입한다!, MBC 250221 방송](https://img.youtube.com/vi/lUxhuwhczn8/maxresdefault.jpg)
