Around 9,000 years ago, on earth roamed various creatures, such as goblins, ghost, demons, dragons, humans, gods and etc. However they lived with chaos, constantly disagreeing with one another causing the world to collapse. One day, a god by the name of, Shen Wen Xing ( 神文幸 ) decided to put a stop with it. He called of the strongest of each creatures and decided to split them in worlds. He split them into 3 worlds, The Underworld ( Ghost Gate, 幽灵门 ), The Middleworld ( Mortal Realm, 凡人世界 ) and The Overworld ( Heaven, 天堂 ).
In the underworld, lived the fallen spirits of both humanoid and animals, such as demons, ogres, goblins and ghost. At first, they've split each other with dividing with tall walls, not allowing them to interact with one another. But around 3,000 years later, they had decided to break the walls down, allowing the people to interact with one another while still having their own district.
In the Overworld, lived heavenly beings and heavenly animals such as gods, dragons and the phoenix. Only such beings are allowed to ascend to heaven with enough cultivation power, other creatures such as the fallen spirits and humans are only allowed to enter the Overworld with the permission of the Heavenly Emperor, they can only ascend with the help of the heavenly creatures. Fallen spirits are only allowed to stay in the Overworld for not more that 6 days, with a break of 2 weeks in between. Whereas humans are allowed to be in the Overworld are allowed to stay for 2 weeks and a break of 5 days.
However, inside the Overworld there was lived a huge prison building, named Mirror's Reflection (自镜反射 ), any creature that was deemed has disobedient will have to spend their days according to the crimes they done in the Mirror's Reflection. In each cell there is a huge mirror that captures every corner, within the imprisoned time given, the criminals will have to self reflect for what they've done, reports were given that those that suffered for more that 10 weeks in the Mirror's Reflection had gone insane and crazy. There was not escape as the huge mirror was unbreakable and all powers are suspended with a huge chain locked around all limbs and the neck. With an exception, the criminals with less heavier crimes are given the choice to be locked up or return to the mortal realm as a mortal to pay off their "debts" by doing good deeds. Not to forget, any heavenly disciples or officials that disobey any commandments will be stripped from all spiritual power and will return to the mortal realm as a mere mortal. Once done, they will ascend back to heaven and will be granted back their powers, for the creatures. The Overworld's heavenly emperor is chosen from Shen Wen Xing's bloodline in gratitude to his magnificent action of bringing peace among all living creatures.
While in the Middleworld, lived humans and normal animals such as horses and cows. A rule was given that the fallen spirit are only allowed to roam for 2 months and had to have a break of 3 months in between but was soon changed that they were allowed to roam for 3 months and a break worth of 2 months, as they deemed as it was unfair to them. The heavenly beings were allowed to roam on earth for 6 months with a break of 2 1/2 months in between.
In spite of that, there was another creature that was viewed as far too ferocious, they are known as blood sucking demons, vampires. They were avoided so much, they weren't even thought to be included in any of the worlds. Despite being despised by every other living creature, legend has it that vampires have one of the largest populations, as they are able to disguise themselves into other beings. After 3,000 years of hiding, the Underworld leaders decided to be merciful on them after Tian Wei Lan ( 天蔚蓝 ) and his wife, Lü Ming Rong ( 律鳴荣 ) — both who were pure vampires, had advised the Underworld leaders with their intelligent thinking from being demolished from the Mayhem Era, this was when the leaders of the Underworld were fighting when they've accused one another of allowing their people to trespass into their district, that was when Tian Wei Lan gave the idea to bring down the walls of each nation, allowing them to roam across the border with freedom would be given a greater future while still having their own districts.
In return, the leaders of the Underworld, gathered together for a meeting with the both of them, in ended with them allowing to live in another world, named The Blood City ( 血城 ) which was ruled by none other than Tian Wei Lan, there was a path connected to the Underworld, as it was an unofficial world. That path was named as The Red Path ( 红路径 ), red implying the blood that vampires thirst for...
Not only that, a promise was made upon the vampires and the other leaders of the Underworld. Firstly, vampires were only allowed to roam out of The Blood City once they have had their meal, to avoid being caught. Secondly, vampires were only allowed to consume blood from filthy people, such a rapist, sexual fetischist, lechers and etc. Before consumption, it needed to be verified by the leader of The Blood City, which then was Tian Wei Lan. If caught without permission, they would be punished by being nailed and hanged upon the door of your house. No one is allowed to remove you till your time is payed off, for each innocent it's 3 days, if anyone attempts so, they too will be punished to be nailed and hang next to them. Shockingly, Tian Wei Lan, vowed that if him and his wife or any descendants from them onwards were to drink the bloods of innocents, they shall be punish by being hung up on the city's front gate.
Yet in the end, vampires were only allowed to roam in the mortal realm under the disguise of other fallen spirits, as nor the heaven officials or humans knew about this contract...