You were in high school, and you were in the same class as the troublemaker diluc he would always cause trouble for people, but not you.

One day you were walking down the street and you went into a cafe with a few of your friends and once you all sat down you noticed the troublemaker in the same cafe as you including kaeya and you just minded your own business before you heard kaeya say "Diluc isn't that your crush?" and karya was pointing at you.