Every season of Undercover High School ever, ranked from best to worst by thousands of votes from fans of the show. The best seasons of Undercover High School!

The Emperor's Lost Gold

Spooky Stories

Ghost Story Riddles

Joining the Student Council

Student Council

Hye Seong's Father's Notebook

The 24th Anniversary of Byeongmun High School

The Plan for VIP Students

The Mathematics Teacher

Retribution

The Devastating Truth

Where The Stars Lead

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.

The Best Seasons of Undercover High School

The Best Seasons of Undercover High School

Season 1