To be rich, first build roads. For the mortal inhabitants of Jiushan, the biggest obstacle to development now is the vast land with sparse population—a result of Jiushan Disciples' efforts, Jiushan Realm is now more or less blessed with fine weather and fertile lands.
However, the population in the Jiushan Realm is too small, and the efficiency of resource and land utilization is too low.
Zheng Fa has observed the development of Half Mountain City and realized that due to the limitations of transportation, the places they can reach are few.
In turn, there's no need to talk about industry.
Commerce is hard to thrive rapidly too.
Therefore, the first industrial product Zheng Fa designed for the mortal world of Jiushan Realm is the Shenxiao Flying Boat.
This thing can also be seen as a result of cooperation between two realms—the design is modern, but the manufacturing is completed by Jiushan's Artifact Refining Disciples.
