"This is the manual for the circulation method." Old Ru handed over the book.
She could read the title right away, which confirmed what Old Ru mentioned earlier.
Day and Night Circulation Method.
"This circulation method affects your soul personally. This will similarly create two cycles of your soul.
"The one for day is basking in light. It has the gentleness and fierceness of the sun. During the night, it becomes cold and violent.
"Even though it's called Day and Night, it's more like two sides that aren't affected by time at all. If you are able to successfully master this manual, you are able to control both the gentleness and the violent power.
"However, among the people who tried to master it, only two people managed to do it. That was why this manual had been sealed to stop anyone from destroying their own bodies.
