Credit: MBC
MBC’s Friday-Saturday drama Undercover High School delivered a game-changing sixth episode as Jung Hae Sung ( Seo Kang Joon ) began an unexpected alliance with Oh Su A ( Jin Ki Joo ) after she discovered his true identity.
The episode recorded 6.7% viewership nationwide according to Nielsen Korea, with ratings peaking at an impressive 10% during the romantic finale scene.
Episode 6 featured a shocking development when security guard Mr. Kim (Goo Min Hyeok), who had planned to meet Hae Sung, died after falling from a rooftop following a mysterious fight. Soon after, Hae Sung discovered his father’s notebook and pursued the mysterious assailant but ultimately lost him. The plot revealed this incident was orchestrated by Seo Myung Joo (Kim Shin Rock) and Park Jae Moon (Park Jin Woo).
Seeking answers, Hae Sung confronted Director Kim (Lee Seo Hwan) about the notebook’s significance, realizing his missing father’s final mission mirrored his own. Later, he decoded clues hidden in a grandfather clock and attempted to uncover Byeongmun High School’s secrets, only to encounter Su A in the student council room, creating palpable tension.
Su A, suspicious about Hae Sung’s presence on the rooftop during Mr. Kim’s death, confronted him about his identity. In response, Hae Sung revealed himself as a National Intelligence Service agent and confessed everything.
He finally revealed his true identity! #UndercoverHighSchoolEp6 #UndercoverHighSchool pic.twitter.com/QRCVYgRgc2 — ChingusOfKDrama (@ChingusOfKDrama) March 9, 2025
