If a person never had a certain item of feeling, they would never yearn for it because they did not know what it could do for them.
Although many Rain Masters in the Broiling Rock Continent could not even keep themselves afloat, there were still experts who emerged from the Broiling Rock Continent.
Green Continent City had received aid from an expert 30 years ago.
He had ascertained the positions of all the Rain Masters within Green Continent City and told them to gather together to address the water scarcity issue.
By forbidding people outside of the city walls from entering, it ensured that the water that the city did have could be used to preserve the lives of the city's residents.
This would give the people outside the city hope and the goal of working toward becoming a Rain Master so they could eventually live within the city.