Cool
In your first sentence, "This world works in pairs, sun and moon, day and night, good and bad, light and dark."
The bold statements, they are only there because of the Sun, the moon is there because the Sun was there billion years ago and the moon with other planets started orbiting it, and of course you only have day and night because of the Sun.
My point is at some point the Sun will die, as calculated in 5 billion years, so when it goes, you won't have your balance, day and night etc. So what you said is not valid then. There is no balance. Also you mentioned the "World" has balance, Light and Darkness really don't care about the world lol.
And for the Good and Bad, that's just a human thing, doesn't really matter/effect for this question.
So what else you got.
This is nice.