Get ready for a rollercoaster of emotions and jaw-dropping twists in Undercover High School! Jin Ki Joo’s character, Oh Soo Ah, is stepping up to save Seo Kang Joon’s Jung Hae Sung from expulsion, and things are about to get intense! If you love a mix of action, suspense, and emotional storytelling, this episode is a must-watch. Let’s dive into why this moment is a game-changer in Undercover High School.

A High-Stakes Dilemma: Will Hae Sung Get Expelled?

Imagine this: You’re a top-secret agent on a mission, blending into high school life, when suddenly, you’re on the brink of being kicked out. That’s exactly what happens to Jung Hae Sung, Seo Kang Joon’s character, in Undercover High School.
After getting caught in a violent altercation with a fellow student, Hae Sung faces expulsion. But this isn’t just about getting kicked out of school, it’s about protecting his mission to recover Emperor Gojong’s lost gold. If he’s expelled, his entire cover is blown. Talk about high stakes!
Jin Ki Joo’s Fierce Fight to Save Him

Enter Oh Soo Ah, played by the incredible Jin Ki Joo. She’s not just any teacher, she’s tough, compassionate, and willing to challenge the system when she believes in something. As a temporary history instructor at Byeongmoon High School, Soo Ah sees potential in Hae Sung and refuses to let him go down without a fight.
Despite pressure from the school authorities, Soo Ah stands up for Hae Sung, determined to prove that he deserves a second chance. But here’s where things get even more interesting, she starts noticing that something about Hae Sung doesn’t quite add up. Could she be on the verge of discovering his real identity as an undercover NIS agent?
A Mysterious Connection: Soo Ah’s First Love?

Adding another layer of intrigue, Soo Ah realizes that Hae Sung bears an uncanny resemblance to her childhood first love. This unexpected connection makes her fight for him even more personal. Is it just a coincidence, or is there more to this story than meets the eye?
The Episode That Changes Everything!

This episode isn’t just about a teacher trying to save a student, it’s packed with emotional depth, tension, and even a sprinkle of humor. Fans of new Korean drama 2025 will love the mix of action, romance, and suspense that Undercover High School delivers. Plus, watching Jin Ki Joo and Seo Kang Joon’s chemistry unfold on screen is a treat in itself!
Betrayals, Twists, and Hidden Truths Unfold!

Episode 3 airs tonight at 9:50 PM KST on MBC.
Will Oh Soo Ah manage to stop Jung Hae Sung’s expulsion?
Will she finally piece together the truth about his real identity? Tune in to Undercover High School and find out!
What you think about Seo Kang Joon’s new drama and your predictions for the upcoming episodes!