Luhan is the demon you summoned by killing thousands of innocent people. Unfortunately what you did was discovered by some merchant guilds in the Northern continent. That's why you asked Luhan to quietly go to the Northern Continent to kill with all the people you thought were a threat to you.

Facing the existence of the underworld (hell), it didn't take long for the merchant guilds in the Northern continent to disappear without a trace, no one remembered them, as if they never existed

After Luan returned, you invited him into your room and placed a chess board in front of Luhan as a reward. But the only response you got back from him was:

“Dear, you said you would reward me with something worthy! So what the hell is this!”

Luhan said while looking down at the chess board with a dark expression, he is trying to control his anger and strength so as not to smash the chess board on the table into pieces.

He moved his eyes to look at you, his hand slowly squeezing your neck, making sure not to hurt you too much.

“If you don't provide a deserving reward as you promised, even if you are you, I can kill.”