This article is taken directly from http://www.bladeandsouldojo.com/topic/1200-the-world-of-blade-soul.
A World Covered in Corruption
The world of Blade & Soul was once a peaceful place filled with humans, animals, and various creatures. Corruption of a demonic nature began to sweep across the land and brought this world into chaos. Light fell to darkness, the oceans became wild, trees withered, and the land shattered. Creatures became violent, animals went wild, and even the humans fell to the corruption.
Martial artists of demonic nature used the corrupt energy to make themselves incredibly powerful. Those that mastered this art began to fill the world with blood. Finally, the source of the corruption, the door to the demon realm, was opened. The Demon Emperor and his demonic servants escaped into our world.
The heavens could not stand idle any longer. The holy beings within the heavens called upon the martial artists of the world and delivered them a prophecy. Those who were bestowed with this prophecy took part in battling the demons and their emperor, driving them back into their own realm and sealing them away.
A world lost in corruption has been found again by peace.
The Country of Woon and Poong-Je
When story became legend, and legend became myth, the world was divided into two. One side was the historical nation of Woon that possessed thousands of years of history within its borders. The other was the new military nation of Poong-Je.
The nation of Woon was strong, and was once united until a tyrant emperor gained power. The nation's people cried out, and their cries were heard by General Goon Ma-Yum. He led a rebellion against the emperor and raised the nation of Poong-Je in the Eastern Lands. The people now behind the secure border of Poong-Je sharpen their blades and their minds, waiting for the day to take vengeance on their tyrant emperor.
Meanwhile, in the western lands, the once gone corruption has returned. The corruption swept across the land like a devastating plague, destroying all livings things. Once passed, everything was either dead or turned into a demonic servant. The lands were given a new name, Suh-Rak, meaning "Western Despair." The corruption quickly destroyed the northern lands as well and is now working its way to the southern nation of Woon and the Eastern nation of Poong-Je.
Distress of the People
The people on Joong-Won, the world of Blade & Soul, were living a difficult and harsh life. The war and bitterness between the nations of Woon and Poong-Je brought forth destruction to much of the land they once held dear. Farms and villages were destroyed, reduced to ash and rubble. The tyranny of the emperor and the arrogance of the army became worse with each passing day. To add to the chaos, bandits and other violent groups became much more active, taking advantage of the confusion and lack of order.
The Lawful League and the Hon-Chun Cult
To help the people and to protect the world they love, martial artists who were on the lawful side took part in efforts to bring order back to the world. However, these efforts were not enough to bring peace and order back to a world lost in chaos. The lawful schools and martial artists put aside their own needs and desires and formed The Lawful League.
Once this league was founded, the chaotic felt threatened and feared this league would be gaining too much power. Then came the Hon-Chun Cult. This cult hid in darkness for many years, believing that there would soon come a day when everyone is equal. This cult received strong support from the people and gradually began to gather an army under its banner.
These two great powers could never co-exist, and their hostility towards each other soon found itself on the battle field. The world had now become even more violent as these two factions struggled for dominance over the other.
The Appearance of Jin Suh-Yeon
During this harsh period, a woman dressed in black stood in the middle of a bamboo shore village, staring up at a mountain peak. A small message bird arrived.
"I've changed the medicine this morning. You must deliver the Hong-Moon Martial Arts book. I'll be waiting."
The bird was on her shoulder as she read the message, there was no emotion on her face. It was as if everything was planned and without hesitation, she gathered her comrades and set out. Yuran and Guh-Guh-Boong wiped the blood from their weapons and prepared to follow her. Around them, bodies of the local militia that were unfortunate enough to have encountered them lay everywhere.
The woman in black clothing was Jin Suh-Yeon. Wherever she goes, there is the appearance of black Chi, followed by a pile of corpses, just like the martial artist who mastered the way of Corrupted Chi long ago. She traveled to the most southern part of the land of the bamboo village. She then stared at the Mountain Peak once more as if that was the end of her travels. She then disappeared, only leaving a trace of black smoke and the messenger bird flying away.
The students of the Hong-Moon school were well hidden from civilization, and trained hard under the care of their masters, leading relatively simple and happy lives. However, as if the heavens knew about the arrival of Jih Suh-Yeon, black clouds began to gather around the school.
Then came the rain.