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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Last updated: June 9, 2026
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Moviely has 16 free Undercover High School cinematic wallpapers available to browse, preview in Mac Mode, and download.
Yes. Every Undercover High School backdrop on Moviely is free to preview and download for personal desktop or mobile wallpaper use.
Undercover High School wallpapers include 4K and HD options. Moviely recommends the best size for your screen and offers original-quality downloads when available.
Yes. Open any Undercover High School wallpaper in Mac Mode to preview it on a desktop or iPhone lock screen before downloading.
Open the Undercover High School page, pick a backdrop, choose your preferred resolution (HD, Full HD, or Original), and click Download.
Yes. Select Undercover High School backdrops are available in 4K / original quality for high-resolution displays.
Undercover High School first aired in 2025. Moviely hosts cinematic wallpapers captured from the TV series's official backdrop imagery.
Undercover High School is categorized as Action & Adventure, Comedy, Drama.
Choi Jeong-in directed Undercover High School.
Undercover High School stars Seo Kang-joon, Jin Ki-joo, Kim Shin-rock, Kim Min-ju, Yoon Ga-i, and more.
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