Hi~~ I'm seung hyun. Your writing is very good but I have one thing to tell you. You said "If the robots replace humans in many parts, people who work in relatively easy work such as a delivery man will be gradually fired." but I think there will be many new jobs in the future.  For example, there can be many job related in robot like robot repair man, producer, and designer. And It takes long time to make delivery robot. So in my opinion, we don't need to worry about this problem!