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2025Ended1 Season12 Episodes
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.
Seasons
Specials
20251 episodes
Season 1
202512 episodes
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