At that time, Korea was very poor.
There were no police, nor schools, nor sewage system,
and the average age which Korean people could live was late 20 yeas old,
and they didn't have custom of taking shower.
After Japan annexed Korea, all of them became opposite.
Japan used an awful a lot of money, human resources, and technology,
for Korean people who were Japanese people at that time by the annexation.
Japan brought Korea great development.