This is the trailer to M Butterfly.  If you watch the entire trailer without knowing what happens in the play, it is really confusing.  I think that the creators of the movie were trying to keep the plot a secret and could not give too much away in the preview.  I really liked the quote, “nothing blinds a man to reality like perfect love.” Gallimard is so set on finding his “butterfly,” that he is blinded by all of the signs that point to Song’s gender.