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The film intensifies as Arthur navigates his relationships, particularly with his mother, Penny Fleck. It’s revealed through a distressing letter that Arthur has long been deceived about his parentage, believing himself to be the illegitimate son of wealthy businessman Thomas Wayne. This revelation feeds into his already fragile psyche, exacerbating his feelings of betrayal and abandonment.
Arthur's fantasies of connection with others, especially with his neighbor Sophie, whose affection he misinterprets, highlight his utter loneliness. It becomes clear that much of what he experiences with Sophie may not even be real, further complicating his mental state.
Embracing the Joker