Two Faces of the World

If I ruled the world, I would like to bring peace and justice to humanity and mankind in all . . . and     a place without blood, massacre, and war. (I would write: "... and create a place without blood, massacre, or war.")

I want to live with peace, even in my dreams. (I think I would write: "I want to live peacefully, even in my dreams.)

If I ruled the world, I would make this place a better place to live, no matter how much bloodshed, conflicts, and deaths it would take to make my wish come true. (Jae, since you write, "how much," bloodshed, conflict, and death should all be singular. If you wrote, "how many," you could write conflicts and deaths, but bloodshed wouldn't work.)

I want to live with hope, even if the cost of achieving it is harsh.

There are those who pray for eternal peace and tranquility among mankind, and there are those who believe in nothing but brutality and battles full of hatred and retaliation. However, the reality does not fully grant either side’s wishes; (I would get rid of "the" before reality.) this world that we have lived in for hundreds and thousands of years has two faces that cannot exist without one another. This world that we live in was created with black-and-white, yin-and-yang, and good-and-evil, and the truth of humanity does not allow either side to consumer the other. (consume) Some of us may try so dearly to resolve conflicts without fighting and settle them with peace; some of us may think fighting is the only way to resolve conflicts and change things.

Neither of them are right or wrong. (How about: Neither persepctive is right or wrong.)
That is why reality does not fully grant either side’s wishes.

Peace
Bravery
Belief

Obliteration
Rebellion
Revenge

I see this world as a coin – one side with a head, and one side with a tail. If heads represents peace and tails represents war, then I believe that most of us would hope for a head each time the coin is flipped. However, there is one distinctive difference between this world and the coin flip: there is no such thing as luck within the conflict of peace and war. In a game of coin toss, you can toss a hundred times and get a hundred heads; in reality, a hundred peace conferences can start another hundred wars. A Hundred wars can end in a hundred peace conferences. Either is possible, and neither is impossible. (I think this paragraph would be better before the paragraph that starts with: "There are those who pray for eternal peace." That way, you could introduce the concept of "sides".)

I feel pain in the existence, the humanity, and the future of our world. (take out "the" before "humanity".)
I feel pain in the peace we believe in, the battles we fight, and countless lives lost within the bloodshed.

We seek peace and tranquility and fear war and death.

Everybody,
stand upon the center of the world,
facing forward,
and charge yourself into the light of heaven
and fear shall be gone.

This is the reality.
This is not an illusion.
This is our challenge.