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1 seasonMBC
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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1 season · 12 episodes
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Seo Kang-joonJeong Hae-sung
Jin Ki-jooOh Su-ah
Kim Shin-rockSeo Myung-ju
Kim Min-juLee Ye-na
Yoon Ga-iPark Mi-jung
Kim Young-ahIm Chung-ha
Lee Hyun SoHan Seung-jae
Yun Chae-binYun Chae-rin
Kim Sun-minJi Hyeon-jun
Kim Seung-beomKim Ho-jin
Kang Pil-junSon Beom-SikAvailability for Undercover High School by JustWatch, via TMDB. All options
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