Undercover High School (2025)

Jung Hae Seong, an elite NIS field agent, faces demotion after a mission goes wrong. Tasked with recovering King Gojong’s missing gold bars, he goes undercover as a student at Byeongmoon High School, keeping his true identity a secret.

There, he meets Teacher O Su A, a dedicated Korean history teacher with a strong sense of justice. As she guides Hae Seong, she begins to see shadows of her first love in him—a love that once left her heartbroken.

With hidden identities, buried pasts, and a high-stakes mission at play, will Hae Seong succeed in his secret operation, or will unexpected emotions change everything?