Starring will smith.

This movie has two endings:

The first ending (release ending) is the moment when the hero successfully isolates the antibody, and the nightmare also invades his fortress. He had to sacrifice his life to let the mother and son who fled here leave. Finally, the two men sent the antibodies he exchanged with his life to several human settlements that were not infected with viruses or antibodies.

The second ending is that after the nightmare broke through the hero's fortress, the male leader drew a butterfly pattern on the glass of the laboratory (the female nightmare who was taken by the hero to do the experiment had a butterfly tattoo). Only then did the hero understand that the nightmare attacked his fortress crazily in order to save the man's lover, the nightmare. Finally, the hero returned the nightmare to the man, completely changing his view that the nightmare had no IQ and no feelings for three years and admitted it.