Undercover High School

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.

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