Chapter 466 explains "Yes."

Star Dream nodded and her voice was deep. "Your mother is a celestial person on the other side of the Big World of Casting God. She has encountered some great changes in the Big World of Casting God, which has brought her to our small world by magic."

"She had planned to stay in this small world all her life, but in a few years, there were people coming to Cast God's Big World. After killing those people, she thought they were safe, but a few years later, there were people there, and the people who came seemed stronger."

"Finally, if Mian had to leave here,...