Mission to Save the World: Starting with a Prodigy Persona

[Ensemble friendship + no romantic pairings + beginner-friendly + not a wish-fulfillment story] The destruction of one world often triggers a chain reaction with consequences beyond measure. G.3516-Qing, a student in the Management Department of the Space-Time Administration, accepts a mission to enter an instance in a small world that has been severely contaminated. She must find a way to eliminate the corrupting energy. The System asks, "Host, how are you going to complete the mission?" She looks at the promising young people of all kinds. The beloved junior sister of a great sect, the only daughter of the wealthiest family, a gifted first senior sister from a small sect, a competitive and combative young master from a prominent clan, a beautiful young spirit who grew up among ordinary people... There are already so many geniuses. Having one more won't hurt, so it's decided: she'll become a genius, too. She'll be the leader of the geniuses, bring the others under her wing, and give them a hand whenever they need it, helping them grow. The pollutants can be dealt with by them. She'll handle the final rewards. What a splendid plan. P.S. The pacing is slow, and the main cast is large, with every character getting a lot of attention. The opening introduces the main characters, and the setup takes a long time. (I didn't want to make it that long, but a section I thought would take ten chapters ended up taking dozens. I'm amazing.) The protagonist may disappear for a long time sometimes. That's normal, so don't pay too much attention to it. (The truth is, the author isn't very good.)