In the film The Danish Girl, Einar and Gerda Wegener are a marriage of Danish artists living for and for art. Gerda is a painter and one day, innocently, they do something that will change the life of marriage forever.
Gerda has to paint a woman, but in the end it is Einar who gets to pose with feminine appearance. The paintings are a sales hit, so they start thinking about something.
She tells Einar that she has to adopt a feminine appearance. At first it is to paint the pictures, but it is becoming a somewhat dangerous game, because neither knows the consequences that will have.
This is how Einar undergoes a metamorphosis, because he realizes that he is very comfortable with his feminine appearance, which leads him to undergo a kind of sex change taking into account the context of the time.