Searching for the Endless Sea

Xun Pray accidentally got a system, and also got the opportunity to turn any book into a secret book for free. So he looked at the "Mortal Cultivation of Immortality" in his hand, his eyes full of expectation. System: "Wait! Host, I hope you will think about it carefully!" He asked suspiciously: "Isn't this book good?" System: "... Anyway, the host please consider it carefully!" So he turned his head to the bookcase behind him filled with 24,000 volumes of Chinese Taoism, and said, "Do you think this is appropriate?" System: "... Theoretically yes, wait! Don't..." From now on, Xun Pray can go to the endless sea waves...