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.
2025
as Jeong Hae-sung
as Oh Su-ah
as Seo Myung-ju
as Lee Ye-na
as Park Mi-jung
as Im Chung-ha
as Han Seung-jae
as Yun Chae-rin
as Ji Hyeon-jun
