Undercover High School – S01E09 – The Mathematics Teacher

Undercover High School Season 1 Episode 9 – Watch online

« The Mathematics Teacher »

S01E09
9.0
March 21, 2025
1 h 08 min
MBC

Episode summary

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.

The legal platforms listed offer the series in the United States; the version (dubbed or subtitled) depends on each service.

Where to stream Undercover High School (S01E09)

Subscription

Rakuten Viki

OnDemandKorea

Kocowa Amazon Channel

Kocowa

Free with ads

Rakuten Viki

Availability provided by JustWatch via TMDB, details on TMDB. Offers in the United States, subject to change.

About this episode

“The Mathematics Teacher” is episode 9 of 12 in season 1 of Undercover High School. It first aired on March 21, 2025 on MBC. It runs 1 h 08 min. It is rated 9.0/10 by TMDB users, against a season average of 8.3/10.

Frequently asked questions

Where to watch Undercover High School Season 1 Episode 9 online?

In the United States, Undercover High School is available with a subscription on Rakuten Viki, OnDemandKorea and Kocowa Amazon Channel, for free with ads on Rakuten Viki (source: JustWatch via TMDB, offers subject to change). The version (dubbed or subtitled) depends on the service.