Overview
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.
Cast
- Seo Kang-joon as Jeong Hae-sung
- Jin Ki-joo as Oh Su-ah
- Kim Shin-rock as Seo Myung-ju
- Kim Min-ju as Lee Ye-na
- Yoon Ga-i as Park Mi-jung
- Kim Young-ah as Im Chung-ha
- Lee Hyun So as Han Seung-jae
- Yun Chae-bin as Yun Chae-rin
- Kim Sun-min as Ji Hyeon-jun
- Kim Seung-beom as Kim Ho-jin