The trip to the Seventh World was quite calm, Liu Yang did not use the traveling ships or some transport item, because he did not trust the others, even if his in-laws gave him some items that allowed Liu Yang to travel through the Nine Worlds.
Liu Yang refused to use these items, as he did not know whether or not there were spies of Remnants remaining in the Xiao clan and the Song clan in the Seventh World if there were, and the Remnants found out that he was in the Seventh World, Liu Yang could fall in their traps.
This was also the case with travel ships, Liu Yang did not know whether or not he had spies of the Remnants traveling together. If there were, it could be a disaster if something happens in space.
Due to these factors, Liu Yang decided to travel on his own until the Seventh World, he used his space power and void power. The journey lasted only a few days before arriving in the Seventh World.