Seo Kang-Joon
Jeong Hae-seong
![Undercover High School [Russian] poster](/_next/image?url=https%3A%2F%2Fpbcdnw.aoneroom.com%2Fimage%2F2026%2F10%2F30%2F0d33cd0940cb8291f4cb5c55024cfd00.jpg&w=3840&q=75)
Action · Comedy · Thriller
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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Jeong Hae-seong
Oh Soo-ah
Lee Ye-na
Seo Myeong-joo
Yoon Chae-rin
Ahn Seok-ho
Go Young-hoon
Park Jae-moon
Soo-ah's Mother
Ahn Yoo-jeong
Park Mi-jeong
Kim Hyeong-bae
Kim Ri-an
Lee Dong-min
Han Seung-jae
Head teacher
Jeong Hae-seong (Child)
Seung-jae’s Father