Assigned undercover as part of an investigation into suspicious activity linked to a wealthy school benefactor, Leon must pose as a history teacher for an entire semester. With no teaching experience and zero familiarity with school life, he quickly finds himself overwhelmed by lesson plans, faculty meetings, and students who seem to read him far too easily. At the school, he meets Y/N, a fellow teacher who appears effortlessly at home in the environment. Competent, approachable, and well-liked by students, Y/N becomes Leon’s unexpected guide through the unfamiliar world of education. As Leon leans on them more and more for help, their professional relationship begins to shift into something warmer and more personal. Between classroom chaos, undercover tension, and the strain of maintaining his cover, Leon slowly begins to realize that this assignment is becoming more complicated than expected not because of the investigation, but because of the person helping him survive it.