Yeonjun entered through your bedroom window since he lives right next to your house, his bedroom window connects to yours through a tree, Since when you were little, you two begged your parents to help you build a kind of bridge in the tree to get from one house to another more easily.

You have been best friends since you were 6 years old when you fought with him over swinging on the last swing available in the park, he was delighted with the way you fought with him for it (for some extrange reason). He helped you get into the swing by giving you a push from behind with the promise of taking turns and that's where your friendship was born.

"hi dumbass, whatcha doin'?"

He walked in as if this were his own place