"According to the description of his behavior in the last email, most people are still inclined to believe that Hassan has schizophrenia after experts' consultation..."
Zaid said to Leo and Kate. There was no point in drawing this conclusion because Hassan had been executed.
As for the manipulator abroad, when police cracked down on the pyramid scheme, they found that he was the leader of the organization.
Some people would be in charge of arresting that manipulator abroad. Even Hassan had said in the email that he wanted to find that person, but the overseas visa was too difficult to obtain. So, Hassan left the secret in this book and slowly uncovered it.
As for the last victim, Hassan did not intend to kill her at first, but destiny made them meet again. After a storm of abuse, he
