“Undercover High School” Unveils Mysterious Connection Between Seo Kang Joon and Jin Ki Joo

MBC’s highly anticipated Friday-Saturday drama, Undercover High School, is set to premiere on February 21 at 9:50 p.m., promising an exciting blend of action, comedy, and romance.

Written by Lim Young-bin and directed by Choi Jung-in, the drama follows the thrilling adventures of a National Intelligence Service (NIS) agent who goes undercover as a high school student to track down Emperor Gojong’s missing gold bars.

The latest 4th official poster, released on February 11, teases the intriguing dynamic between Seo Kang Joon (Jung Hae-seok) and Jin Ki Joo (Oh Soo-ah), who cross paths in an unexpected setting—a hospital. The two characters share an intense gaze across a desk, hinting at a deeper, fateful past that binds them beyond their present roles as student and teacher.

The mysterious tagline, “We look alike, that guy back then,” suggests a hidden connection, raising curiosity about their past and how it will unfold as they become entangled in unexpected school events.

Seo Kang-joon plays Jung Hae-seok, an elite NIS agent who is forced to blend in as a high schooler for his top-secret mission. Meanwhile, Jin Ki-joo stars as Oh Soo-ah, a temporary teacher at a prestigious private school, who is simply trying to survive in a challenging environment. Their forced partnership—a mix of cooperation and conflict—leads to humorous, heartwarming, and action-packed moments throughout the series.

With a perfect balance of comedy and romance, Undercover High School promises engaging twists, clever disguises, and dynamic chemistry between its leads.

The production team shared, “The fourth poster hints at a special past connection between Hae-seok and Soo-ah. As their relationship unfolds, viewers can look forward to exciting revelations about who recognizes whom first.”

Mark your calendars! Undercover High School premieres on February 21 at 9:50 p.m. on MBC—don’t miss this thrilling undercover adventure!