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.
- Created by
- Im Young-binChoi Jeong-in
- Network
- Origin
- KR
- TMDB rating
- 8.0 / 10 · 62 votes
