After a failed operation in Seoul, elite National Intelligence Service agent Jeong Tae-seong loses everything that defined him: his status, his superiors’ trust, and his right to work in the field. The only alternative to a court-martial is a humiliating undercover assignment.

He is sent to a place where power wears a school uniform.

Under a false identity and forged documents, Tae-seong enrolls in an elite private high school attended by the children of ministers, chaebols, and people who shape the country’s future behind closed doors. Officially, he is just a transfer student. In reality, he is a living threat detector embedded inside a flawless system of lies, rankings, and privilege.

The school becomes a battlefield without weapons.
Here, people are destroyed not by bullets, but by rumors.
Bones are not broken — reputations are.
Surveillance is carried out not by guards, but by glances.

Tae-seong must locate stolen state secrets hidden somewhere within this “golden cage” without exposing himself or harming a single student — even those who may deserve it the least. His past leaves him no room for mistakes.