Polar Immortal

[Fantasy + Immortal Cultivation + No System + Time Travel] Chu Yun traveled to the immortal world with an unknown book he bought from a street stall. He was walking in the mountains with a black dog. On this day, he accidentally fell into a cave. There was a stone statue enshrined in the cave. There was a coffin under the stone statue. Curiosity drove Chu Yun. Chu Yun went to check and found that there was a person in the coffin...