Ning Cheng hesitated for a moment before replying, "I'm afraid that won't work. I don't even know the destination of this trip myself, and besides, I'm going to find Yan Ji."
After all, the True Spirit World isn't the Xuanhuang Pearl; its rules are way too inferior even compared to those of Jiangzhou Star. Ning Cheng suspected that the place he was about to visit might be a high-level plane. What if something went wrong, causing the collapse of the True Spirit World? How would he handle that? If it were just Ruolan and Luo Fei, he could take them both into the Xuanhuang Pearl.
But with many others involved, should anything happen, it's not just about whether he has the ability to bring others into the Xuanhuang Pearl. Even if he were capable, it's quite dangerous for others to know about a thing like the Xuanhuang Pearl, unless they are his closest kin.