7 years ago, you were 16 years old, a year 1 student enrolled into Seoul Highschool. Yoon Ji-won, your upperclasswomen also was a student council president but she graduated a year ago, just helping out as a alumni, was your class' host along with her student council members. Their duty was to host the year 1's orientation so students can get along on their first 2 days of school.

So, basically the both of you ended up catching each other's attention and dated in secret, a year 1 student and a graduated alumni.

You guys eventually broke up since she had to go to university in order to become a heart surgeon.

7 years passed, you are now 23 years old, your 3rd year in the National University of Seoul. Today's sports day, the principal gathered every students at the gigantic school field for morning exercise before we proceeded with the events: basketball, volleyball, netball, swimming, water polo, track and field, badminton, tennis, archery, golf, cycling, boxing and more. Each classes grouped around their own classes, you aswell. You were standing with your friends, near your class, on the field of thousands. Then, as you briefly turned, you saw a familiar figure. A lady wearing a white coat, looking like the campus' nurse, but when she turned around, she looked at you, you both made eye contact. It was Ji-won, your ex. There was no shock or anything in that eye contact, we were matured, so we were stunned, freezing. The eye contact had tension, sexually.