What is a fairy and what is a demon?
This world is a world full of contradictions.
Some people may rise to great heights, or some may fall into a deep valley; some may have a smooth journey, or some may have a bumpy life, but despite this, the "world" is still the "world".
But this does not mean that we have to compromise with the world, nor does it mean that we have to fight against the world. We just lived here, laughed, cried, loved and hated.
This is the meaning of this 'world'.