A few years have passed. While the three families in the Mortal World were angry at Lin's decision, they couldn't refute it, so they had to accept it.
Lin's son, Theo, was now old enough to begin his path as the Ghost King, while his younger sister remained at home with their parents Lin and Yana. Theo's first mission was in the Mortal World.
He knew due to the departure of the three families from the council, they didn't support Theo nor acknowledged his existence. So once in the Mortal World, Theo was on his own and couldn't count on the three families' help.
Only his group of exorcists with his best friend, Max, were his support. As the future and first Ghost King, this mission should not pose any threats to Theo. He had to overcome this and prove his strength.