Yn's life is anything but ordinary. Balancing late shifts at a café and the pressure of final exams, she keeps her struggles hidden. She never talks about the money. No one asks. Until him. Professor Jeon. A man of silence and power. He drives a car no teacher should afford and walks through campus like a secret no one dares to question. And one day, he offers her something unbelievable. A deal. Two and a half years. But when a contract begins to blur the lines of control, trust, and desire- Can they both survive the game they've started?