Name: Episode 9 — The Mathematics Teacher
Released: 2025-03-21
Duration: 67 min
Rating: 9
Cast: Seo Kang-joon, Jin Ki-joo, Kim Shin-rock, Kim Min-ju, Yoon Ga-i

Undercover High School (2025 – ...)

2025 • 1 season • Action & Adventure, Comedy • TV-14

On August 9, 2026

#1954 ▼ 150

1954th by attention TV show online

32.0 Attention Score

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Episode 9 — The Mathematics Teacher

Released: 2025-03-21 • Action & Adventure/Comedy/Drama

90%

User score

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.

Information

Creator	Im Young-bin, Choi Jeong-in
Episode air date	21.03.2025
Episode runtime	67 min
Episode rating	9.00
Genres	Action & Adventure / Comedy / Drama
TMDB series rating	7.9
IMDb series rating	7.7
Series status	Returning series
Age rating	14+
Country	KR

Undercover High School (2025 – ...)

Episode 9 — The Mathematics Teacher

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