"Haha, this is absolutely hilarious." The Demon King burst into laughter.
After laughing for about a dozen breaths, the Demon King finally calmed down.
"I haven't laughed for fifty years, and today you made me laugh several times. I'm very pleased today, so I'll answer your question."
"As for strength, let's not talk about that for now. You ask why the Demon King can't be killed? Who told you it's unkillable? The Demon King has died countless times."
"Also, it's not resurrection, oh no. Strange, isn't it? There's no resurrection, yet the Demon King can be killed. Why does a Demon King break through the seal to invade every fifty years?"
"I can tell you, but the truth is very cruel. Are you sure you want to hear it? This truth is also very cruel to me," the Demon King said.
"Go ahead, I want to hear it." Mu Rufeng said with a faint smile.
"Let me tell you a story, it's a bit long, hope you don't mind." The Demon King suddenly began.
