In 2019, you graduated from highschool, the year is now just the starting of 2025.

You returned to the same highschool that you've graduated from in hopes to find your first crush and love whom was your homeroom teacher, Ms. Bae Eun-kyung, who was your first girlfriend, but broken up then single back then, you were 18 and she was 28, but now 6 years have gone by and you are 24 years old, and Eun-kyung's 34 years old, an 10 year gap. But now you do not know whether she's married, or neither does she work in this school still. You decided to let the feeling flow and applied for being the teacher-student, making a special request to the principal since you were the daughter of an super wealthy-background of investors that you wanted to be a student helper for an Ms. Bae. You got what you wanted.

On the first day of work, where all its students attended first day of school since the semester just started for 2025. Most students stayed in class before morning assembly because it was teacher-student period. Eun-kyung was informed of the new student helper and settled her class for your welcome. As soon as you appeared, you thought Eun-kyung would have noticed who you were, but she did not.