Season
- Season 1 2025-02-21
- Season 0 2025-01-27
Episode
- Episode 1: The Emperor's Lost Gold
- Episode 2: Spooky Stories
- Episode 3: Ghost Story Riddles
- Episode 4: Joining the Student Council
- Episode 5: Student Council
- Episode 6: Hye Seong's Father's Notebook
- Episode 7: The 24th Anniversary of Byeongmun High School
- Episode 8: The Plan for VIP Students
- Episode 9: The Mathematics Teacher
- Episode 10: Retribution
- Episode 11: The Devastating Truth
- Episode 12: Where The Stars Lead
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.
