Yu Xun leaned sideways, pressed his ears completely against the stone wall, and listened attentively - however, there was no sound there!

He thought to himself: It is estimated that last night, the terrible and terrible sound of "mountain ghost night cry" should be due to the fact that the wind on the mountain at night was particularly strong, and the strong mountain wind penetrated those thin cracks!

When Yu Xun expressed his analysis, Yingyu, who had seen and heard a lot, immediately added: "What Yu Gongzi said is reasonable! I think so: As for why those voices sound "gloomy and complaining, like weeping and complaining", they are like wild ghosts crying and complaining -- this should be related to the fact that the mountain wind blew very quickly that night, and the cracks on the stone wall were not only extremely small, but also their cracks were tortuous and very complicated in distribution!"

When Yu Xun and Shi Ming heard this, they all nodded again and again.

However, no matter how you explain this phenomenon of "mountain ghosts crying at night", anyway, it is clear and corroborates a fact - that is, the "Qinglan Dicui" boulder is indeed hollow, and there must be a cave or something like space hidden inside!

So, the question arises again: who would spend such a huge price to hollow out the inside of a boulder?

"That's a bit incredible!" Yu Xun thought of the "ghost fire" phenomenon that appeared bizarrely behind the boulder last night, and felt that there were still a lot of doubts about the secret of the boulder!

So, he said to his two assistants: "Even if this is the case, how can we explain the "ghost fires" that inexplicably appeared last night?"

Ying Yu immediately took over and said, "I remember that when I was a child, I was in the graveyard outside the village, and sometimes I saw ghost fires at night. From this, it can be inferred that the "ghost fire" phenomenon you saw last night is probably due to the fact that there are bones stored in that huge stone cave!"

Yu Xun felt that this analysis was also very reasonable, lowered his head and thought about it, and said: "Then, let's look for it together and see the secret cave inside the boulder - where is its hole?"

In this way, perhaps it was due to the sincere induction of the gods on the mountain to Yu Xun, or perhaps it was the secret guidance of the heroic spirits of his parents...... After sleeping on the mountain for a night, Yu Xun finally found out through the revelation given by the sound of the "mountain ghost crying at night" and the strange and ethereal "ghost fire" - on Qinglan Mountain, there is a hidden place that retains the secrets of the past!

So, what are they going to do next? Only then will they be able to successfully find out the entrance to the boulder cave? Moreover, even if they finally get into that secret cave, what will be waiting for Yu Xun and them?

Hearing Yu Xun's arrangement, Ying Yu and Shi Ming agreed in unison, and the three of them immediately rolled up their sleeves and "started......

However, from the appearance, the whole boulder is clearly integrated - although its stone wall is covered with many small cracks with twists and curves and complex textures, although there is strong evidence such as "mountain ghosts crying at night" and "weird ghost fire" last night......

Indeed, what was clearly placed in front of the three of them was a large chunk of heavy and tamped rocks, if it was to be said that it was actually hollow, with a large hole hollowed out in it...... Such a judgment, even if the evidence is conclusive, will inevitably lead to doubts about the results of one's own reasoning......

However, Yu Xun's earnest desire to find the remains of his parents strengthened his determination to never turn back! He was determined to unravel this seemingly indestructible boulder—the hidden mystery!

Thinking of this, in order to cheer up the two assistants, he said in a loud voice full of pride: "Two brothers, crack the earth-shattering secret hidden in this "Qinglan Dicui" boulder, and it will fall on you, me, and the three of us today! Let us work together to seize this unearthly honor!"

Yu Xun had just finished speaking, when he suddenly found Shi Ming staring at his feet—his expression was obviously a little strange at this time!

Yu Xun couldn't help but glance at his feet, and found that there was a small toad squatting there!

But why, is it that a person who is so close to his feet and can remain motionless all the time unless this toad, which is not alive at all!

However, if you look closely at the little toad, it looks so lifelike!

Yu Xun tentatively rubbed it with his foot - who knew that the toad still didn't move, as if it didn't feel anything!

The little toad's calm "attitude" really annoyed Yu Xun, and he was holding a sulk in his stomach - he quickly lifted his leg and kicked it back hard! Who knew that this time, he only heard the sound of "suddenly-lulu" several times - and immediately, a small doorway appeared on the stone wall!

But it turned out that the little toad carved out of stone under his feet just now turned out to be the mechanism that opened the small doorway!

The clever Eagles immediately picked up a longer branch and stirred it into the cave for a while—he was afraid that there would be some kind of hidden weapon in the small doorway......

After making sure that there was no danger, he was the first to get into it! The hole was not really large, and only one person could barely squeeze into it with his head bowed and bent over......

"Yu Gongzi, come in and take a look!" immediately came from the cave with a sharp shout.

As soon as Yu Xun heard such a shout from the Ying Bird in the cave, he was worried that he had made a mistake, so he didn't say a word, and immediately a dodge also drilled into the hole......