"Roar! Roar!" Gazing at the direction Yu Kai was speeding, the nine-headed lion's nine heads shook anxiously. All nine heads simultaneously lit up with dazzling light, followed by a series of thick beams of light, each as swift as lightning. Just as Yu Kai reached the mysterious area that had drawn him in, the beams struck him with a thud. "Boom!" With a deafening roar, Yu Kai's body instantly shattered!

Countless broken limbs and arms flew everywhere, eventually turning into ashes and disappearing without a trace. The nine-headed lion finally felt relieved, carefully surveying the mysterious area. After confirming that there was no damage at all, it flew back to its cave.

Zhong Kui and the Ghost King exchanged a glance, their eyes filled with awe and caution, and bowed respectfully once more toward the restricted area. Then, they rose and flew toward Fengdu City, their figures quickly disappearing into the darkness.

The entire restricted area returned to its former tranquility. However, within that mysterious area, a drop of blood slowly wriggled, as if possessing life.

Within this mysterious region lies an immense mechanical heart, beating rhythmically, each beat shimmering with a shimmering shimmer of interwoven blue and purple light. It is the energy source of the entire underworld, responsible for transforming mysterious energies such as cosmic rays and dark matter into the powerful psionic energy that powers its normal operation. Surrounding it are countless intricate, spider-like pipes and wires, extending to every corner of the underworld like a sophisticated neural network, continuously transporting energy and information.

The drop of blood actually crawled upward along these tubes, climbing up bit by bit with difficulty. Soon, it reached the edge of the mechanical heart. Without the slightest hesitation, the drop of blood drilled straight in.

After a long moment, a figure slowly emerged from the heart. A fat man, covered in psionic energy, fell heavily to the ground with a thud, his flesh trembling violently.

"Ouch!" the fat man cried out. He opened his eyes and looked around with curiosity and a hint of fear. Above him, he saw a dense network of pipes and wires. He sat up suddenly and subconsciously touched his sparse hair. Then, as if thinking of something, he touched his chest and carefully examined his body.

"What's going on? Where the hell is this? Am I already dead?" He pinched his thigh hard, "Ouch! It hurts!"

"I'm not dead, my injuries are actually healed! Young Master, where's the young master?" He immediately jumped up like a spring. He was surprised to find that he could roll over so easily, and hurriedly checked carefully. "I've become stronger! This is the peak of the Grandmaster! How did I become so strong?"

"Master, Young Master!" He shouted loudly around him, finally flying over the beating mechanical heart. He found Yu Kai's figure inside the heart. At this time, Yu Kai was floating in the middle of the heart, constantly absorbing the psionic energy generated by the heart.

Seeing that Yu Kai was alright, he felt reassured. Just as he was filled with curiosity about this mysterious area, he saw a massive shadow approaching at breakneck speed. Just by looking at the nine massive heads, he knew it was none other than Zu Weng. Frightened, his legs gave way, and he collapsed to the ground, his body shaking like a sieve.

Zuweng's nine massive heads kept sniffing around outside this mysterious area, trying to get a glimpse of what was happening inside. Just now, it had sensed an unusual movement in the cave. This place was incredibly important to the underworld, so it didn't dare delay and rushed over to investigate.

At this moment, Yu Kai felt as if he had stepped into another, strange dimension. He continued forward, following the shimmering light. Suddenly, eleven orbs of light, each imbued with a unique energy, appeared before him. Sensing Yu Kai's approach, the orbs spun around him like joyful spirits. These eleven orbs seemed to possess a vibrant life force, scanning Yu Kai from head to toe.

"My friend, how did you get here?" One of the light beads filled with illusory power floated in front of Yu Kai and asked.

"Senior, I don't know either, and I don't know where this is. I only remember being killed by my ancestor!" Yu Kai hurriedly bowed and answered respectfully.

"Who is the ancestor?" A ball of light wrapped in blazing flames asked impatiently.

"A nine-headed lion!" Yu Kai said without hiding anything.

"Is it the mount of the Lord of the Underworld?" A light ball with spatial fluctuations spoke.

"Yes, senior, he is now the Taiyi Savior of the underworld! The nine-headed lion was named Jiuling Yuansheng!" Yu Kai bowed again and said.

"Why are you being chased by him?" the somewhat illusory light ball continued to ask.

Yu Kai didn't hide anything and told the whole story. "Seniors, I just want to find my mother and rescue my sisters. I don't deny my crimes. Please let me go."

"My friend, we are just energy bodies and have no right to let you go. Moreover, you must not reveal anything about us to anyone else, otherwise you will encounter endless troubles." The illusory light ball said in a deep voice.

"It's okay. As long as I'm not dead, I will definitely find a way to escape from the underworld. I hope you seniors don't stop me." Yu Kai looked delighted. "Seniors, what is this place? Did you save me?"

"That's not the case. You saved yourself. There is a mysterious power within you, and it was this power that saved you. This is the energy core of the underworld, and you are currently at its heart."

"My friend, even if you manage to escape from the underworld, the underworld will definitely report this matter to the higher authorities. I'm afraid that the Heavenly Court will also send a large army to hunt you down, and you might be wiped out by them."

"It's okay. As long as people are not dead, there is hope. Even if we have to face the Heavenly Court, we must fight back. What if we succeed?" Yu Kai did not take the Heavenly Court's pursuit in the future to heart. If he worried too much at this moment, it would be bad.

"Young friend, you are quite optimistic and open-minded. How about this! Since you can set foot here, we are destined to meet. We will each give you a power of the origin law, hoping to help you."

"Thank you all, seniors!" Yu Kai was filled with joy and bowed immediately!

"Of course, we also hope that if you can grow up in the future, you will have the opportunity to protect the underworld!" The illusory light bead continued.

"If there really comes such a day, I will definitely do it!" Yu Kai answered firmly without any hesitation.

"Don't you hate the underworld?"

"The underworld has its own laws, and I did violate them. They hunted me because of our different positions. I don't hold a grudge against them!" Yu Kai paused. "If such a day ever comes, I will definitely not stand by and watch someone die!"