Monster City is divided into an inner city and an outer city. Ana Shen must pass through the inner city to go to the 'Bell Tower'.

In Monster City, there is a strict hierarchy.

Those who have not reached level five are not qualified to enter the inner city. Like NPCs below level three, they are not even qualified to peek over the wall of the inner city from the outside ...

The little witch told Ana Shen seriously that she was just a third-level NPC with no friends in ...