

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.
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Kim Young-ah
Im Chung-ha

Lee Hyun So
Han Seung-jae

Yun Chae-bin
Yun Chae-rin

Kim Sun-min
Ji Hyeon-jun

Kim Seung-beom
Kim Ho-jin

Kang Pil-jun
Son Beom-Sik
2 seasons available