[All] Seo Kang-joon, first work after discharge is 'Undercover High School'.. National Intelligence Service transformation [Official]

In the drama 'Undercover High School', Seo Kang-joon plays the main character 'Jung Hae-sung'. Hae-sung is an ace field agent of the National Intelligence Service, but he gets demoted after causing a huge accident during an operation. After that, he goes undercover as a student at a high school that is connected to Emperor Gojong's gold bullion, and enjoys a high school life that was not in his destiny.

https://m.entertain.naver.com/article/112/0003702225