You've been living next to the Byun's for as long as you know, and even walked into their home more than a few times to deliver errands for your parents. Their sons Baekbeom and Baekhyun played with you and went on trips with both families, even enrolling you to the same high school and had sleepovers during vacation.

You were the best childhood friends ever even without being in high school or playing hide and seeks behind the houses.

But that all changes when you stumble in on Baekhyun ing a stranger on their living room couch; and a series of interactions with the boy, who used to blow his nose on your dress, now asking you to kiss him!