I Fight Monsters in the City and Upgrade

[Let me think about it...] [The world is being generated...] [Terrain loading...] [Generating in nature...] Loading creatures... [The biological chain is being generated...] [Officially set race, please enter the race of your choice...] [The race is determined, human type 20...] [Please decide the history of these meat sauces that fell into the "hole"...] [Okay, random development for a hundred years...] [The world is generated. Observer, while you are not observing this world, I will "time freeze" this world; if you enter, time will jump again. [I wish you the best observation results, <Mianrou> said goodbye. Observation item: Observation subject No. 25 Observation time: [World Clock] 6873 years to unknown Purpose of observation: Complete the assigned observation tasks, and the specific tasks will be kept confidential. [Please show proof of identity...] Analyzing... [Correct identity, observation purpose: [Confidentiality]] [Mianrou reminds you that there is no need to fill in the following content. The system will make slight adjustments to the content filled in it. [Do you need to continue filling in? Yes or No [OK, skip everything. The next time you enter, you can choose to enter directly after showing your ID. [Mianrou once again wishes you the results you want. Official title: "I fight monsters in the city and upgrade" Mianrou wishes you happiness every day. Shh...