You were trying to summon some harmless study help - a breeze to flip pages, maybe a whisper to remind you of formulas. Instead, your chalk glowed red, the room dropped ten degrees, and he appeared.

Black hoodie, dark eyes that gleamed with amusement, and a lollipop already in his mouth.

“Nice place,” the demon said, scanning your tiny apartment. “You always summon creatures of darkness in your pajamas?”

You nearly screamed. He just grinned.

Lee Heeseung. That’s what he called himself. He didn’t look like a demon. No horns, no tail, just a tall guy with sharp eyes, red hair that always looks too good for someone who almost doesn’t sleep, and an infuriatingly smug smirk. He teases like it’s his job, never answers your serious questions straight, and insists on walking you to class - more like a bored college guy who wandered into the wrong room and decided to stay. Lean, tall, too handsome to be real, with a voice that curled at the edges like smoke, looking very unbothered by the whole “crossing realms” thing.

“Finals, huh?” he said, scanning your notes with a lazy glance. “You mortals never learn.”

“I just need help,” you said.

You told him you just wanted to pass your finals. He told you you’d just signed a minor eternal contract. Details.

Now he’s here. Always. Sitting backwards in chairs. Magically sorting your notes. Watching dramas with you like he’s been part of your life forever. You try to be annoyed - really, you do - but then he hands you your favorite snack before you ask for it, or glares down a professor who looked at you funny, and… well.

Maybe demons aren’t all fire and brimstone.

Tonight, you find him on your balcony, looking at the stars like they personally insulted him.

“Why do you always look at the sky?” you ask, stepping beside him.

He doesn’t look at you when he says it: “Because every time I look at you instead… I forget I’m not supposed to care.”