Seo Kang Joon navigates his chaotic school life in 'Undercover High School'

The fourth teaser for Undercover High School has been released.

Undercover High School tells the story of a National Intelligence Service agent, Jung Hae Seong (Seo Kang Joon), who goes undercover as a high school student to track the whereabouts of Emperor Gojong's missing gold bars. 

The teaser shows Jung Hae Seong (Seo Kang Joon) navigating his school life. As a National Intelligence Service agent, he infiltrates the school disguised as a high school student to carry out a mission, which leads him to some unexpected challenges.

The teaser commences with showing Hae Seong chasing someone relentlessly. However, the next moment, viewers see him dressed in a school uniform heading to school. On his first day at the new school, he makes a flashy entrance and captures the attention of all his classmates. 

Amidst this, his superior, Ahn Seok Ho (Jeon Bae Soo), cautions him, "Don't get involved with the students." However, Hae Seong is seen standing in front of a suspicious building with his classmate Lee Dong Min (Shin Jun Hang), and he spends his days bickering with his homeroom teacher Oh Soo Ah (Jin Ki Joo), leading to a whirlwind of chaotic moments. Additionally, the scene where Hae Seong is dragged out by troublemaker Park Tae Su (Jang Seong Beom) hints at the challenging school life that awaits him.

In this way, Jung Hae Seong is faced with the unavoidable fate of becoming a high school student overnight. It raises curiosity about how he will interact with the students and teachers at school and whether he will be able to maintain his secret identity while uncovering the whereabouts of the gold bars.

Undercover High School is set to premiere on February 21. The K-drama will be streaming on KOCOWA+ and Viu.

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