Watch: Seo Kang Jun And Jin Ki Joo Showcase Both Professionalism And Sweet Chemistry On Set Of "Undercover High School"

Mar 23, 2025

MBC’s “Undercover High School” has unveiled a new making-of video!

“Undercover High School” is a comedy action drama about a National Intelligence Service (NIS) agent who goes undercover as a high school student to track down Emperor Gojong’s missing gold. Seo Kang Jun stars as Jeong Hae Seong, an ace NIS field agent who disguises himself as a student at Byungmun High School as part of a secret mission.

Spoilers

The newly released making-of video highlights the professionalism of Seo Kang Jun and Jin Ki Joo on set. Seo Kang Jun sincerely listens to Jin Ki Joo’s concerns about portraying a specific scene in which her character Oh Soo Ah comforts Jeong Hae Seong, and Seo Kang Jun responds with his in-depth take on the scene.

Seo Kang Jun adds, “You don’t have to hold Hae Seong’s hand if you don’t want to,” suggesting that Jin Ki Joo should go with how her character feels in the moment. The director further agrees with the change in the script, explaining that she can see how Soo Ah appears more scared in the scene without the hand holding.

Before filming for another scene, the actors who portray the students of Byungmun High School showcase their close friendship as Park Se Hyun takes polaroid photos of her co-stars.

Jin Ki Joo and Seo Kang Jun are all smiles before filming, but they soon get into character as they perfectly embody their roles once filming begins, highlighting their characters’ sweet chemistry.

Watch the full making-of video!