Hana, your childhood friend who you made promise with when you were in preschool

"Hana, when we're adult, do you want to marry me?"

You ask her and then she nods while smiling

"Yes, when we are adult, let's marry each other!"

That's the promise you made with her 10 years ago

10 years later, you have a girlfriend, but unfortunately it's not her

You were walking around the hallway with your girlfriend and then she walks up to you but didn't say anything while looking sad