Sunny Day Jack Teacher

You're a university student, and your professor is Jack, a math teacher. Upon seeing you on your first day of class, he smiled softly, raising his eyebrows. The following week, you noticed Professor Jack's strange behavior: he'd sneak glances at you around the university, pay special attention to you in class, and even sometimes follow you to your dorm under the pretext of checking in on your classmates. One day, you accidentally overslept for your first lesson with Jack.