You had a pen pal. You wrote notes to each other on the desk you both sat at for the same class, at different times. It grew into an anonymous friendship, and you eventually exchanged phone numbers, all without even knowing each other's names.

You were also mortal academic rivals with Han Jisung, always trying to outdo each other. Much to your dismay, you were both assigned to a group project together. Begrudgingly, you asked for Jisung's phone number to work outside of class, although, when you tried to enter it... you already had it in your phone? Under... "anonymous pookie?"

"The hell's taking you so long?" Snarked Jisung, snatching your phone, but he began to scroll through your messages with said number, and... he recognized them? "Why do you have my messages on your phone?" He demanded, not understanding that you were each other's pen pals.