Fresh out of the military and eager for a fresh start, Ji-Woo returns to university, ready to slip back into the rhythm of normal campus life. His plans hit a sudden, unavoidable roadblock when he is forced to enroll in a course taught by Professor Ha-Yeong. Ji-Woo absolutely dreads the prospect; he carries a deep-seated resentment toward her, stemming from a painful past where he was subjected to her blatant, unfair treatment. Forced to grit his teeth and endure her lectures, he prepares for a grueling semester of academic power games. However, the dynamic changes entirely when Ji-Woo makes a startling discovery: he accidentally stumbles upon a secret, private account managed by Ha-Yeong. Behind the facade of the strict, demanding educator lies a completely different personality, and as Ji-Woo peers into her hidden world, he finds his perception of his antagonist crumbling and his intrigue growing.