In the past millennia, there was a visual-reality world called, Eternal Mystery, which changed everything in the world. Many people started playing Eternal Mystery because they can do whatever that want inside the visual world. Everything inside the game are possible, but not always everything that is possible.

Everyone plays the game from morning until midnight without stopping. Although, it was bad for the human's health, but the company who made the game has created a solution regarding to that problem. As more and more people enter the game, everything changes. The combat inside the game are harsh and complicated, but nobody complaint about that because the game itself is the challenging part. Which made players continue to grind, farm, and level up. Eventually becoming a veteran in just less than a month.

One day, the surface of the Earth expanded mysteriously, a large portal rifts appeared on every countries around the world, countless monsters and other species surged out from the portal rifts, and started wreaking havoc and destruction on every cities of the world. That day, humanity realized that the Eternal Mystery has merged to the real world.

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Many people suddenly began to feel changes on their body, they gained superpowers and superhuman bodies, thus, they were called as "Players." They have the ability to [Level-Up] and pick different [Class] to increase their power, and to fight back against the invasion. Ruling class started to exist and many people have awaken their potential to become a "Player," but not all of them are lucky.

Once a person awaken as a "Player" they will have a chance to obtain a lower or higher class depending on their destiny. Those who obtained a lower class will be put to the lowest position, but those who have a higher class, will rise above the position and be recognized by the public. As I said, ruling class exist in this world. Those who are the higher class can bully the lower class. Basically, in this world, the strongest rules over the weak.