Right now, a person was sitting in a chair when suddenly one more person appear on that room and told him,
"Sir, your plan has already been discovered by the king and he has already destroyed all the summoning symbols and also captured all your subordinates. Your son also gets captured by the king."
As you can tell, it was the duke and the person that gave him the information was a spy, who worked for him.
"Tch!!!! Useless brat. I already told him to stay careful. But he did not listen to me. He also sent those two abyss humans to do something. He should just die." Duke said that after hearing the report. After that the spy went away from there.
At that time one more person appeared in the room but this time it was a girl. Actually it was the wife of the duke who appeared in the room. After coming in front of the Duke she told him,
"I know that you are angry at your son but you need to save him."