'Undercover Agent in High School?' Seo Kang-joon Returns to K-Drama After 3 Years with Jin Ki-joo—Why Everyone’s Talking

Even before its official release, a new drama is generating massive buzz just from its teaser. The show in question is none other than 'Undercover High School,' touted as MBC’s most anticipated drama for the first half of 2025.

On January 5, during the broadcast of the '2024 MBC Drama Awards,' a surprise teaser for 'Undercover High School,' set to premiere in late February, was unveiled. The drama follows the story of a National Intelligence Service (NIS) agent who goes undercover as a high school student to track down the whereabouts of Emperor Gojong’s lost gold. It promises to be a thrilling blend of crime, investigation, action, coming-of-age, and romantic comedy genres.

The teaser, revealed for the first time during the awards show, immediately set social media and online communities ablaze. The unique premise of an agent disguising himself as a high school student drew praise for its originality, heightening anticipation for the drama. The chemistry and acting compatibility between the lead actors Seo Kang-joon and Jin Ki-joo also received an overwhelmingly positive response.

The plot centers on ace agent Jung Hae-sung (played by Seo Kang-joon), who, while chasing down the trail of the lost gold, finds himself navigating an unexpected new life in a high school. Despite being a calm and meticulous agent, his interactions with high school students lead to a series of daily mishaps and comedic events.

Meanwhile, passionate substitute teacher Oh Soo-ah (played by Jin Ki-joo) finds her routine disrupted when Hae-sung enters her classroom as a student. Her strong sense of justice sparks new dynamics in her relationship with Hae-sung. Adding tension to the narrative, Seo Myung-joo (played by Kim Shin-rok), the cold and calculating chairman of Byungmoon High School, clashes with Hae-sung, amplifying the drama’s intensity.

Namkoong Sung-woo, MBC's executive producer, shared his excitement for Seo Kang-joon’s return to the screen following his military discharge. "Forget everything you’ve seen from Seo Kang-joon before. With a combination of action, comedy, and romantic elements, he’ll showcase an impressive range of performances that are sure to captivate viewers. Paired with Jin Ki-joo, known for her incredible romantic chemistry, and Kim Shin-rok, who brings a commanding presence to every scene, the ensemble cast will deliver a dynamic and engaging viewing experience."

The first episode of 'Undercover High School' is scheduled to air on February 21.