Chu Nan asked a lot of questions before, which surprised him a little. But he could know more or less, and tell some. But Chu Nan's last question made him silly.

after thinking about it for a long time, old demon Chu shook his head and said, "the boundary division above seems to exist. Whoever makes it doesn't know, who spreads it doesn't know."

"that's enough."

"enough?"

old devil Chu wondered, "I don't know if it's enough?"

in fact, Chu Nan thought that the old devil of Chu would answer by convention, but he didn't expect that the old devil of Chu didn't know either, and the things that the...