So, I'll be straight to the point...
The book is set in a modern timeline. Although it is modern (slightly older to our Earth's current era), it is an alternate world.
The setting begins in Haug, a district of Auburn City. Together, there are eight districts in Auburn(they'll be introduced gradually in the book --- I'll only update this place with the Districts that appear in the novel so, it is possible that not all eight districts will be mentioned.)
Auburn City:
One of the few cities of an even bigger nation. Both small in size (about 3,000miles from east to west and 3,500miles from south to north, more than half of which are undeveloped lands and areas of dungeons) and with a population of about 2,000,000. It shares its borders with two other cities on both sides. It consists of eight districts, some of which are:-
Haug District: A district about 200miles long and 200miles wide. Luke's home district from birth. it was fairly developed with good roads, water and even low rate of crime. The highest building within this district was the District Agency which was thirteen story tall. It had a rivalry with its neighbor, Daug District. During the past ten years, it had experienced five wins and five losses.
Daug District: A neighboring district of Haug, Luke's district. It was home to Darious Welmund. With a similar size and population as Haug, both sides behaved like rivals. They competed in almost everything, including Chosens. They even held a competition every year between the two districts to show who had the strongest newbies.
Sven District: Auburn's capital district. It was more developed compared to the others with most of its building over four story's tall. Auburn's Chosen Agency had its headquarters built here. A building over one hundred meters tall with thirty floors.