Is there any chance to learn about "real people" who came out of Taoist gods in "The Legend of Rivers and Lakes"?
1.
After entering the game, if you go to Laojun altar more often, you will have a chance to meet Zhenren Zhang and talk to him.
2.
He will sell you the secret book Rootless Tree, which costs 10 gold ingots. It is too dark, but you must buy it.
3.
Read the secret book Rootless Tree. If you read it more than a dozen times, you will get a note, and then you can become a disciple.