Undercover High School

Undercover High School

"Undercover High School" is an engaging South Korean action-comedy series that premiered on February 21, 2025, on MBC TV. The drama stars Seo Kang-joon as Jeong Hae-seong, an NIS agent who, after a demotion due to a failed operation, is assigned a covert mission to locate Emperor Gojong's missing gold bars. To accomplish this, Hae-seong goes undercover as a student at Byeongmun High School, concealing his true identity.​ At the school, Hae-seong encounters Jin Ki-joo's character, Oh Su-a, a dedicated homeroom teacher committed to her students' well-being. As they interact, Su-a begins to notice striking similarities between Hae-seong and her first love from childhood, who left her with painful memories. This unexpected connection adds depth to their evolving relationship, intertwining their past and present.​ The series also features Kim Shin-rok as Seo Myeong-ju, adding complexity to the storyline with her intricate character portrayal. As Hae-seong delves deeper into his mission, he uncovers hidden secrets within the school's corridors, leading to thrilling action sequences and comedic situations. The narrative masterfully balances suspense and humor, keeping viewers eagerly anticipating each episode.​ "Undercover High School" has garnered attention for its unique plot and the compelling performances of its cast. The chemistry between Seo Kang-joon and Jin Ki-joo enhances the storytelling, making it a must-watch for fans of action-comedy dramas. The series airs every Friday and Saturday at 21:50 (KST) on MBC TV and is available for streaming on platforms like TVING and Wavve in South Korea, as well as Viu and Kocowa in selected regions.

Details

🙂 Native Title: 언더커버 하이스쿨
🌎 Also Known As: Undercover High School
🎭 Genres: Action, Comedy, Spy
🏷 Tags: Undercover Agent, High School Setting, NIS Agent, Hidden Identity, Teacher-Student Relationship
Screenwriters: Im Young-bin
🎬 Directors: Choi Jung-in
🇰🇷 Country: South Korea
🎬 Episodes: 12
🗓️ Aired: February 21, 2025 – March 29, 2025
📅 Airing Days: Friday & Saturday
📺 Original Network: MBC TV
Duration: 60 minutes per episode
🔞 Content Rating: 15+ – Teens 15 or older

  • Hae-seong’s Daring Infiltration: In the opening episode, NIS agent Jeong Hae-seong (Seo Kang-joon) executes a high-stakes infiltration into Byeongmun High School, setting the tone for his undercover mission.

  • Classroom Tensions: The intense classroom interactions between Hae-seong and his homeroom teacher Oh Soo-ah (Jin Ki-joo) highlight the challenges of balancing his secret mission with student life.

  • Uncovering Hidden Secrets: Hae-seong’s discovery of concealed clues within the school’s restricted areas adds layers of suspense and intrigue to the narrative.

  • Confrontation with Antagonists: The thrilling face-offs between Hae-seong and the school’s corrupt officials showcase the drama’s action-packed sequences.

  • Emotional Flashbacks: Flashbacks revealing Hae-seong’s past and motivations provide depth to his character, enriching the storyline.

  • Byeongmun High School: The primary setting, a prestigious institution, serves as the backdrop for most of the drama’s events.

  • Seoul’s Urban Landscapes: Various scenes capture the bustling streets and modern architecture of Seoul, reflecting the city’s vibrancy.

  • Traditional Korean Houses: Certain episodes feature hanok-style residences, blending contemporary and traditional aesthetics. 

  • Local Cafés and Eateries: Intimate conversations between characters often occur in cozy cafés, adding authenticity to the setting.

  • Historic Sites: Incorporating Seoul’s historic landmarks adds depth and context to the storyline.

  • Modern Student Attire: Characters don contemporary school uniforms, reflecting current South Korean fashion trends. 

  • Sleek NIS Agent Outfits: Hae-seong’s undercover gear combines functionality with style, emphasizing his dual identity.

  • Elegant Teacher Ensembles: Oh Soo-ah’s wardrobe showcases professional yet approachable attire, aligning with her nurturing role.

  • Dynamic Cinematography: The use of vibrant color palettes and dynamic camera angles enhances the drama’s visual appeal.

  • Symbolic Accessories: Key props, such as Hae-seong’s watch, serve as subtle narrative devices throughout the series.

  • Identity and Deception: Explores the complexities of leading a double life and the moral dilemmas it entails.

  • Corruption in Education: Sheds light on systemic issues within elite institutions and the impact on students.

  • Redemption and Growth: Characters undergo personal transformations, emphasizing the power of second chances.

  • Loyalty and Betrayal: Highlights the significance of trust and the consequences of its breach in personal and professional relationships.

  • Youth Empowerment: Encourages young individuals to challenge injustices and advocate for change within their communities.

  • Seo Kang-joon’s Comeback: This drama marks Seo Kang-joon’s return to television after completing his mandatory military service.

  • Jin Ki-joo’s Versatility: Known for diverse roles, Jin Ki-joo portrays a dedicated teacher, showcasing her acting range.

  • Rising Star Kim Min-ju: Formerly of the girl group IZ*ONE, Kim Min-ju transitions into acting with a significant role in this series. 

  • High School Setting: The drama offers a fresh perspective by combining espionage elements with a high school backdrop.

  • Positive Reception: Early episodes received praise for their engaging plot and strong character development.

​​​“Undercover High School” has not received any awards. The series premiered on February 21, 2025, and is currently airing. Award nominations and ceremonies typically occur after a show’s completion. Given its strong viewership ratings and positive audience reception, there is potential for future recognition.

There is no public information or credible reports confirming a real-life romantic relationship between Seo Kang-joon and Jin Ki-joo, the lead actors of “Undercover High School.” Their on-screen chemistry has been widely praised, but it appears to be confined to their professional roles. Both actors have expressed mutual respect and admiration for each other’s work during interviews and promotional events. However, any speculation about a personal relationship beyond their professional collaboration remains unsubstantiated.

Trailer

Music / OST

Gallery

Cast

Jeon Bae Soo
Jeon Bae Soo
Seo Kang Joon Korean Actor
Seo Kang Joon

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