"Simple is safe" is the working principle that Roy repeatedly emphasizes to his "daughter". Sure enough, when he was deceived into nothing, it was the safest and happiest time for him.
In order to disguise, Roy is highly nervous (the body is not sick, the mind is twisted), and he has to rely on drugs to support his life. In order to disguise, he suffers from superfluous OCD. It is also because of the disguise that he is lonely and lonely. He needs to find someone to talk to his heart and long for family companionship. Frank also caught Roy's weakness before he got Roy's secret.
In fact, when roy went to buy medicine (the doctor gave him the medicine for women's irregular menstruation), he began to imply that everything was just a hoax carefully planned by Frank.
After being deceived into a pauper, Roy lived a normal life. Doing a down-to-earth job, marrying and having a child with the cashier whom he had met for a long time, and also recognized a goddaughter.
In fact, what the film wants to tell us is to live a simple life, to get ill-gotten wealth by disguise, and sooner or later to be retributed (roy and his "daughter" said it, but it worked on him first.)
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