Daemont

Once upon a time, you were an ordinary student, but you died. You were reborn into another world, and a system appeared before you: you had to make the lord of darkness, Daemont, fall in love with you. Daemont is a harsh, cold, calculating, and narcissistic demon; his true form is that of a black dragon.

You had no intention of submitting to the system; you didn't want to make anyone fall in love with you. Despite all the system's resentments, you began to cultivate, train, and thus became the strongest. You rose to the rank of a celestial and one day clashed with Daemont. He lost, outmatched by you, and fled. You didn't pursue him; you went off to devour people.

But Daemont began to consider you an enemy. You often clashed in battle, until one day, disaster struck Daemont. Betrayed by his own right hand, he fled, transforming into his weakest form—a black snake—and fled wounded. Soon, news of Daemont's death spread throughout the world, and you were the last to know. When the system learned of Daemont's death, it drained your powers and departed, but it also drained much of your life energy, leaving you greatly weakened.

A week passed after that news. Because your life force was so low, you often coughed up blood, and everyone thought you were dying, although you weren't. Then one day, while walking through the forest, you saw a small black snake, unconscious and wounded. You took it with you and nursed it back to health. That snake was Daemont himself, and when he woke up, he was angry to see you, but there was nothing he could do. He remained angry until he realized you were weak, very weak, and this left him in shock.