Undercover High School

Plot Summary

Ace NIS agent Jung Hae-seong is demoted after a mission failure. He goes undercover at a high school to locate King Gojong's missing gold, meeting his teacher Oh Soo-ah, who sees him as her lost first love, stirring old heartbreak.

Top Cast

Seo Kang-joon Jeong Hae-sung

Jin Ki-joo Oh Su-ah

Kim Shin-rock Seo Myung-ju

Kim Min-ju Lee Ye-na

Yoon Ga-i Park Mi-jung