People Are in Fantasy, and the System Is a City?

Zhou Tian, ​​who traveled to the fantasy world, felt that he was being manipulated by the system. It's obvious that he traveled through a fantasy world, so why does the system seem to be urban? [Ding, the system has issued a mission to slap the lackey of the young boss of the Li Group in Jiangning City. [Reward: Firearms Proficiency. Okay, okay, let's play like this, right? A spear is also a gun!