Episode Title: The Mathematics Teacher
As Su A recovers in the hospital following the attack during the break-in, Hae Seong and the team uncover the culprit: Lee Jun Ho, the mathematics teacher. When Hae Seong detects his father's notebook missing, he realizes that Seo Myeong Ju orchestrated the break-in. After Lee Jun Ho's arrest and confession, the revelation of the school's grade-rigging scandal throws the institution into chaos. Amid the turmoil, Hae Seong stumbles upon a crucial clue to the final scary story.
(Source: Viu)
- Aired: March 21, 2025
Undercover High School Recent Discussions
Title | Replies | Views | Latest Post | |
---|---|---|---|---|
![]() | After 4 episodes, how do you see the rest of the kdrama? by Sayuu | 6 | 0 | sekc Aug 11, 2025 |
ROMANCE ASPECT.. by Hee-Jin | 24 | 0 | elliewashere2 Apr 10, 2025 | |
![]() | Review article on Undercover High School by Cho Na | 1 | 0 | Shinnosuke_Lee Mar 30, 2025 |
Undercover High School Episode 9 Reactions
Was this review helpful to you?
Was this review helpful to you?

Was this review helpful to you?
Trending Articles
Chinese netizens slam 'Tempest' and Jun Ji Hyun, alleging anti-China content
News - Sep 19, 2025
Details inside
Jun Ji Hyun’s luxury brand endorsements face backlash in China amid the 'Tempest' controversy
News - Sep 22, 2025
Backlash against Jun Ji Hyun over alleged anti-China content in her comeback K-drama 'Tempest' grows
'Positively Yours' to replace and edit Yun Jin On's scenes following his DUI scandal
News - Sep 18, 2025
Positively Yours has released its official stance regarding Yun Ji On stepping down from the upcoming K-drama.
'Reply 1988' casts confirmed to reunite next month!
News - Sep 16, 2025
The Reply 1988 reunion is finally confirmed.
'Positively Yours' removes Yun Ji On from the cast following his arrest for drunk driving
News - Sep 17, 2025
Yun Ji On, who became more known after Love Next Door, was caught driving under the influence (DUI).
'Confidence Queen' changes timeslot amid 'Bon Appetit, Your Majesty' competition speculation
News - Sep 16, 2025
'Confidence Queen' aims to avoid competition with highly rated shows
'Would You Marry Me?' starring Choi Woo Shik & Jung So Min confirms its premiere date!
News - Sep 17, 2025
SBS has confirmed the premiere date of the upcoming romantic comedy K-drama Would You Marry Me?
Ji Chang Wook, Doh Kyung Soo's Disney+ action K-drama 'The Manipulated' confirms premiere date
News - Sep 22, 2025
New Disney+ original 'The Manipulated' is coming soon
'Study Group' actress Han Ji Eun is under fire for alleged animal abuse
News - Sep 15, 2025
Actress Han Ji Eun is receiving criticism due to alleged pet abuse.