The Underground Demon King City was a concept Yila had previously read about in a book. Whether it was true or false remained unclear... The book mentioned that the past Demon King Territory was a vast and invincible castle.
It was slightly smaller than the entire current Demon King Territory, divided into inner and outer city areas... The inner city was the main castle belonging to the Demon King alone, while the outer city was the territory of various leaders.
At that time, the Demon King City was divided into the Aboveground Demon King City and the Underground Demon King City, with two rulers: the "King of the Aboveground" and the "King of the Underground." They respectively governed demonic creatures that needed light and those that didn't.
Unfortunately, Senata wasn't very old. If those ancient Blood Clan members hadn't betrayed, they might have known some related information. But there were no "ifs" in life.
