The lawyer's adoptive father is a sanctimonious pedophile who preys on young boys. Maybe he has some friends with the same hobbies, and he often shares his "prey" with them. The "devil boy" played by the young lawyer and the fourth sister are all their victims.
The boy has some kind of super power that can protect himself, maybe awakened after a certain attack (see Carrie the Witch). He was framed as a demon, and the warden, trusting the priest, kept the boy in a cage. Later, a real estate woman with empathy ability pulled out the tube of her lawyer's adoptive father.
After discovering the truth, the warden couldn't bear the torment in his heart and committed suicide, and told the boy to find a lawyer who was also the victim after he went out, but the boy was imprisoned so mentally that he thought he could go out with the lawyer to get revenge...
In the spoiler, there is a scene where the fourth sister wears a suit and uses a laser pointer to tease the cat. It is estimated that the lawyer won the lawsuit for him, and maybe it will end well. Instead of becoming a demon, he conquered the shadows of childhood.
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