Oh Su-ah — Undercover High School Character Profile

About Oh Su-ah

Devoted homeroom teacher at Byeongmun High School. She notices similarities between her undercover student and her heartbroken childhood first love, triggering painful memories.

Oh Su-ah — Character Profile

Character Facts

Played by

Jin Ki-joo

Appears in

Undercover High School (2025)

Role

Protagonist

Relationships (5)

• Oh Su-ah — Romantic Love Interest — Jeong Hae-sung (Seo Kang-joon)

  NIS agent develops feelings for fellow student

• Oh Su-ah — Social Friend — Seo Myung-ju (Kim Shin-rock)

  Close friends in school

• Oh Su-ah — Conflict Rival — Lee Ye-na (Kim Min-ju)

  Compete for academic achievements

• Oh Su-ah — Social Friend — Park Mi-jung (Yoon Ga-i)

  Classmates and friends

• Oh Su-ah — Social Friend — Yun Chae-rin (Yun Chae-bin)

  Part of friend group

Explore the full interactive character relationship map of Undercover High School

More characters from Undercover High School

• Jeong Hae-sung (Seo Kang-joon)
• Seo Myung-ju (Kim Shin-rock)
• Lee Ye-na (Kim Min-ju)
• Bully Student (Eps 2) (Kang Soo-bin)
• Kim Ho Jin [Informant] (Kim Seung Beom)
• Park Mi-jung (Yoon Ga-i)
• Im Chung-ha (Kim Young-ah)
• Han Seung-jae (Lee Hyun So)
• Yun Chae-rin (Yun Chae-bin)
• Ji Hyeon-jun (Kim Sun-min)