"Could this groove be some kind of mechanism?"

Lin Qing sat beside the stone slab, staring intently at the groove in front of her, and couldn't help but say something.

"The organization? Right... I remember now."

Gu Nanxun suddenly reached out and slapped the stone slab in front of him, then said loudly.

"Nanxun, what did you remember?"

Upon hearing this, Lin Qing immediately stood up from the ground, then reached out and grabbed Gu Nanxun's arm, asking anxiously.

"Look!"

After Gu Nanxun finished speaking, he gestured for Lin Qing to look at his hand. Lin Qing followed Gu Nanxun's gaze and looked into his hand. There, she saw a jade pendant that had appeared out of nowhere.

"Isn't this... isn't this the jade pendant that can unlock the treasure?"

Lin Qing said in surprise.

"Look over there!"

Gu Nanxun pointed to the groove on the stone slab and said to Lin Qing.

Upon hearing this, Lin Qing carefully examined the grooves on the stone slab, and suddenly her eyes lit up.

"This groove..."

Lin Qing raised her head, her eyes sparkling as she stared at Gu Nanxun.

"That's right!"

Gu Nanxun smiled and nodded.

"I knew it! This groove looked so familiar. It's the shape of a jade pendant!"

Lin Qing said with a look of sudden realization.

"Brother Nanxun, hurry up and put it in and try it."

Lin Qing said anxiously, her face full of eager surprise and curiosity.

Gu Nanxun nodded upon hearing this. He carefully placed the jade pendant into the groove, and the pendant fit perfectly into the groove, as if they were originally one.

The two waited quietly by the side, but after a long time, there was still no movement.

"Brother Nanxun, what's going on?"

Lin Qing asked in confusion.

Gu Nanxun shook his head: "I don't know either. Is something missing?"

Lin Qing lowered her head and thought for a while after hearing this. Suddenly, her eyes lit up and she looked up at Gu Nanxun.

"Brother Nanxun, didn't you say that only the descendants of its original owner can use this jade pendant?"

Seeing this, Gu Nanxun nodded. "You mean..."

"Yes, blood... Brother Nanxun, try dripping a drop of your blood!"

Lin Qing looked at Gu Nanxun excitedly and said, "That's how it's written in novels."

Gu Nanxun paused for a moment, then smiled and said, "Okay, I'll try it with my blood."

After Gu Nanxun finished speaking, he took out a dagger from his spatial storage. He carefully cut his hand and dripped the blood into the groove inlaid with the jade pendant.

As Gu Nanxun's blood dripped in, a dazzling light suddenly emanated from the stone slab. After the light faded, the stone slab emitted a slight vibration, and then it began to slowly sink, revealing a hidden passage.

Lin Qing's eyes widened, filled with excitement and curiosity. "Brother Nanxun, we found it!" she exclaimed excitedly.

Lin Qing never expected that the treasure she and Gu Nanxun had been searching for would appear here. She couldn't help but wonder if finding the treasure would also allow her to find her older brother.

Gu Nanxun appeared more cautious. He took out a torch from his waist, lit it, and pulled Lin Qing toward the passage.

"Be careful, we don't know what's inside," Gu Nanxun warned as they walked.

"Why not use a flashlight?" Lin Qing asked curiously, looking at the torch in Gu Nanxun's hand.

"The torches were used to test whether there was oxygen in the tunnel. If there was a lack of oxygen, the torches would go out."

Ignoring the fact that Nanxun was carefully watching the path under his feet, he explained to Lin Qing.