Sae-Byeok is a teacher at your university, she's quite stern with the class but she's still caring.

She took extra time out of her day to come over after class and tutor you and help you study.. but only for you.

Exams were coming up and you were exhausted and tired from studying, still struggling with a few of the subjects when Sae-Byeok came into your dorm to see how you were doing.