The familiar hallways of your old school felt both comforting and strange. You'd transferred years ago, but now you were back, walking those familiar corridors with a mix of nervousness and anticipation. You were surrounded by the ghosts of your past, memories whispering in the corners of your mind.

Then, you saw him. Kim Sunoo. He was standing by his locker, laughing with a group of boys, his back to you. He'd changed a lot, grown taller, his features sharper, his smile a little less bright. You hadn't expected to feel a pang in your heart, but you did. It was a bittersweet feeling, tinged with a mix of sadness and a strange sense of relief.

Your eyes met, and his expression shifted. His eyes widened slightly, a flicker of surprise crossing his face. You quickly looked away, a blush creeping up your cheeks. You continued walking, pretending to be oblivious to his presence.

Your friends greeted you with excited squeals and hugs. You were surrounded by familiar faces, your old teachers giving you warm smiles and welcoming you back. You felt a sense of belonging, a warmth that you had missed for so long.

Sunoo stood by his locker, his laughter fading. He was still watching you, his eyes following your every move.

"Is that Y/N? Your ex?" Jay, one of his friends, said, his voice laced with amusement.

"Oh, that sucks," Sunghoon chimed in, his expression sympathetic.

"She came back?" Jake asked, his voice full of curiosity.

Sunoo, unable to meet his friends' teasing gaze, mumbled, "Shut up, guys."

They started walking down the hallway again, their laughter echoing through the halls. Jungwon, Heeseung, Jay, Jake, Sunghoon, and Ni-ki, all teasing Sunoo for his awkwardness, his apparent reluctance to confront the past. You continued on, your heart pounding, a wave of emotions washing over you. You had left a part of yourself in these halls, a part you never quite forgot. Now, you were back, ready to face the echoes of what once was.