In comparison to our time, the current generation lacks reliability, or so they say. Yet, isn't he the son of the great Hero? How frustrating. It has been more than a decade since the epic battle between mankind and the demons came to an end. The children of the brave heroes who saved the world have all grown up now. Among them is Earth, a gifted young man who was expected to follow in his father's footsteps and become a warrior to protect their country. However, Earth always felt uneasy about inheriting his father's title. One day, Earth discovers his father's legendary sword, the very same one that was used to defeat the Demon King, sealed away in their family mansion. Little did he know, the spirit of the Great Demon King was trapped inside the sword, unable to move on and still roaming the world. For some reason, only Earth could see the spirit of the Demon King, and the Demon King took possession of him through the sword. Forced to coexist with the powerful spirit, they lead a strange and shared life. And when the Demon King whispers to Earth on a whim, things take an unexpected turn. "I hold a grudge against your father. If you want revenge against him and the world, I can train you. I have nothing but time," the Demon King offers. Earth receives personal training from the Demon King, solely for the purpose of getting back at his parents and the world. And as the days go by, the hero's parents, the legendary heroes of the past, his first love, the princess childhood friend, the geniuses of the era, and the entire world will tremble at what is to come.
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