I found a cave on the mountain. There are two old men inside. Can you help me find the name of a book?

I have a book whose title I can't find! In the previous chapter, a little boy accidentally opened a hole on the mountain. Inside, there were two old men. One was a god, and the other was a demon. They entered the little boy's body... The little boy recognized the two elders as his grandfather…Such a book! solve
It starts off like this: A child opens a grave on a thunderstorm day, and then two old people enter his consciousness. What's the name of the novel? His biological grandfather became a gun god after his death.

Answer 1

"I was a Taoist for a few years." This book is a suspense novel that you said I wasn't suitable to write. The general plot of this novel is as follows:

"A born fool had a bizarre experience when I was young and embarked on a journey of learning. However, I didn't expect that my experiences would become even more unbelievable. Who was the awe-inspiring man in the cave and that mysterious man? What was his motive? Why did he keep pestering me? So I wasn't born a fool, but was harmed by someone. What was the reason for all of this? ".
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"Pieces of Haunted Valley" was a novel written by the mysterious young man. The general plot of the novel was:

What secrets were hidden in the cyan bookcase that their ancestors brought back from the nameless mountain? Decades later, several brave young people carried the cyan bookcase and pursued the mysterious truth. Strange body movements, strange weapons, tenacious beliefs, snow demons in the snow mountains, terrifying blood corpses, volcanoes in the sea... This book will bring you into a magnificent scene. Conspiracy, darkness, power, horror, adventure, and ghosts…the only thing they could not defeat was the human heart.
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The book,"My Mysterious Story of Mountain Driving", was a novel about urban life written by the author, Qianli Jiayin. The general plot of the novel was:

Zhang Hao had accidentally found a [Mountain-chasing Illustrated Guide] in the cellar of his ancestral home. The book recorded in detail all kinds of experiences, customs, and various 'mountain treasures' and 'strange objects' of the Mountain People. He inherited the ancient inheritance and became the last Mountain Chaser in the world. He trained the goshawk to scout the way and the blind bear to be his partner. Listen to the wind to distinguish the cave, watch the stars to see the treasure. They searched for the magical thunderstruck wood in the mountains after the rain, picked the earth ganoderma by the cliff, caught the precious medicinal insects in the dangerous caves, and even the legendary fox getting married and the mountain spirit and wild monster asking for a title…
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"Odd Travels" was a suspense novel written by the author, Xiao Mifei. The general plot of the novel was:

This was a travel story about traveling through another world. It happened to two little lolis and an otaku. The two twin daughters and their father had accidentally obtained an ancient book, which was the Strange Travels. They needed to follow the keywords in different worlds to complete all kinds of strange plots. Open your brain, and soon you'll discover the truth of these worlds and why it's you!
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The Mysterious Lost Treasure was a suspense-adventure survival novel written by the author, Black Pine Smoke. The general plot of the novel was:

An ordinary young man who grew up by the sea accidentally activated the pineal gland in his brain through a mysterious black stone in his family's inheritance, allowing him to activate an unknown ability. Through the clues in the family's relics, he gradually searched for the amazing treasures lost in the long river of history. From then on, he brought his brothers, met a beauty, searched for treasures, and searched for gold. The wonderful story began from then on…
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"The Inheritor of Yin Meridians" was a mystery novel written by the author, I Love Hongtashan. The general plot of this novel was:

In order to save me, my grandfather and second uncle blocked the calamity for me. My grandfather died, and my second uncle went missing. In order to find my second uncle, I used the Meridian Guarding Atlas as a clue.
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"The Years of Archeology" was a suspense-mystery detective novel written by the author, Wang Jiang Zhishui. The general plot of the novel was:

"When we were building the tunnel, we found something strange. After the firecrackers were fired, a black mountain appeared. It was vertical and the hammer couldn't move it. Even if we hit it hard, not a single piece of it fell. Moreover, the sound was muffled."
"Oh, what is it like?"
"This mountain is dark red and black. There are regular tiny cracks of 50 centimeters. The surface is smooth, but it's especially hard. The sound of the hammer hitting it is muffled, not the traditional clear sound."
"Do you still think that it's a rock when the sound is muffled? Could it be that you can't even distinguish between stone and wood? I don't believe that you've studied for so many years in vain. Besides, if you thought it was a rock, you would have called me to ask."
"Blockhead? Why would there be wood in the middle of the mountain?"
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"The Strange and Bizarre Investigation Group" was a suspense novel written by the author, Xiu Shan. The general plot of this novel was:

The old house next door that had been empty for decades suddenly opened a 'detective agency'? The boss is a beautiful sister with a super good figure? Don't think that it's a good thing. The protagonist went to apply for the job on the first day of the opening. From then on, he began to live a life of being driven, enslaved, and used as a gun... Don't worry, he's still enjoying himself! The scouting team was sent out again. The protagonist was the young man who was carrying two hundred kilograms of luggage and two big bags in his hands.
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"Preface to the Fairy" was a fantasy-mystery fantasy novel written by the author, Coiling Mountain Tiger. The general plot of the novel was:

Light and darkness, death and rebirth. Two suns appeared in the gloomy sky, illuminating two paths. One was glory, and the other was shame. One sun extinguished the other, and the long-eared youth held both the black broken sword and the cross. In grief, he began his path of revenge…
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"Starting with mortals, opening the blind box" was a novel written by Z from afar. The general plot of this novel was:

"Open the blind box!" [Acquired Item] 1882 bottle of plain water, a crumpled 10 yuan, half a bag of gold, ordinary pet food, white, ordinary! [Barrett Sniper Rifle][Number of times activated 10/10][World unlocked][Mortal Cultivation World] This was the story of a handsome young man whose parents were still alive. Without the system sprites or any hints, he explored the blind box system by himself and repeatedly traveled through the myriad worlds to seek immortality. The current tentative process was: Mortal Cultivation Legend-Under One Person-Spirit Cage-Eternal Life-Battle Through the Heavens.