Tao Xing's flying ship was of high quality, a semi-supreme Dao artifact.
Once Ning Cheng was aboard, he stayed in a cabin and didn't come out again, seemingly unconcerned about where the ship was heading.
Nalan Ruxue had advanced to the Heavenly Position Realm, greatly increasing her strength. However, faced with three Heavenly Position Realm cultivators stronger than her, she still felt apprehensive. But when she thought of Ning Cheng, she calmed down. Ning Cheng was so astute that he certainly foresaw the dangers, even though Tao Xing and the others were stronger than her.
Thus, while Ning Cheng was in seclusion in the cabin, she also stayed in her cabin to stabilize her cultivation.
Neither Ning Cheng nor Nalan Ruxue came out to inquire, so Tao Xing and the others naturally did not take the initiative to explain to Ning Cheng.