Undercover High School Concludes with Emotional Finale

Undercover High School (언더커버 하이스쿨) has wrapped up its run, leaving viewers with a profound sense of emotion and satisfaction. The final episode of the MBC drama, which aired on March 29, 2025, showcased the journey of Jung Hae-sung (서강준) who completed his mission to recover Emperor Gojong's gold bars, while Oh Soo-ah (진기주) achieved her dream of becoming a teacher, and Seo Myung-joo (김신록) faced justice with a life sentence.

In the gripping finale, Hae-sung, having narrowly escaped from an overturned vehicle with Soo-ah's help, found himself in a precarious situation as he was wanted for the murder of Director Kim (이서환). Unable to return home, he summoned the National Intelligence Service's Domestic Team 4 to his motel. They needed to retrieve a USB containing evidence against Myung-joo, but during their escape, they encountered the police. While Team 4 held off the officers at the door, Hae-sung lured them away, allowing Soo-ah to rush to the school to protect the students.

With a bounty on his head, Hae-sung cleverly manipulated Team Leader Gong (임철형) into believing that all the chaos was orchestrated by Myung-joo and that the USB with the evidence was at his home. Trusting Hae-sung, Gong retrieved the USB, which Hae-sung then used to turn himself in and expose Myung-joo.

In a bid to quell student unrest, Myung-joo assured them that there would be no academic misconduct, scholarship cancellations, or tuition hikes. However, student An Yoo-jung (박세현) confronted her about why Soo-ah was dismissed, prompting other students to rally against Myung-joo.

As the National Intelligence Service's Domestic Team 4 arrived at the school with arrest warrants for Myung-joo and Jae-moon, chaos ensued when a fire alarm triggered the sprinklers, flooding the school with water. Myung-joo, holding a lighter, created a tense standoff with Hae-sung, who approached her with a gun. Just then, Lee Ye-na (김민주), who had been heading home, returned to intervene.

In a heart-stopping moment, Myung-joo aimed the gun at her own head, but Soo-ah bravely threw herself in front of her, saving her at the last moment. The situation concluded with Myung-joo and Jae-moon facing trial. Initially, Jae-moon claimed sole responsibility, but Hae-sung's persuasion led to Myung-joo receiving a life sentence.

The fate of the hidden gold bars was also revealed when Hae-sung discovered a star sticker placed by his father in his rooftop room. This led him to uncover the gold bars stamped with Emperor Gojong's seal hidden beneath the floorboards. In a romantic twist, Hae-sung confessed his feelings to Soo-ah, culminating in a kiss that delighted fans and solidified the 'Hae-Soo couple' as a beloved pairing.

Viewers expressed their appreciation for the series, praising the thrilling action sequences and the emotional depth of the story. Comments included, "I didn't expect such intense chase scenes from Seo Kang-joon," and "The school setting was perfect from start to finish. Soo-ah was a true teacher protecting her students."

Undercover High School captivated audiences with its fast-paced narrative and the intriguing undercover story of a National Intelligence Service agent, concluding on a high note with a happy ending.