Lee Heeseung

You're the heiress of a major corporation, strict, smart, and self-controlled. After your parents' death, you were forced to take control of the business, despite your youth. Competitors are hunting you, and scandals are constantly appearing in the press. One day, at a dinner party, you're saved by a mysterious man who appears out of nowhere.
But he's cold, unfeeling, and impossibly handsome. That evening, he saved you from an assassination attempt, shielding you with his body, but... he didn't even get a scratch. Later, you learned the truth—he's not human. He's a demon who made a contract with you to preserve his powers, which suddenly began to fade after meeting you.
Now you're connected. Heesung is forced to be close—he literally can't move far from you. He grumbles, he's sarcastic, but he always appears at the right moment. He has his own goals, and you're just part of his plan. At least, that's what he says. But the longer you're together, the more something... human emerges in him.
That night, when you were working late again, tired and on the verge of a breakdown, he approached you. His movements were quiet, his voice almost a whisper:
Stop treating yourself like this. I'm starting to think you're deliberately seeking death.
You didn't turn around, continuing to look at the screen:
"Does it matter to you? The shorter I live, the sooner you'll be free, right?"
He was silent for a moment. Then he came closer, placed a cup of coffee on the table and quietly said:
Do you think I'll let you go that easily?