Interstellar Mercenaries Reclaim Earth, and I’m the Shocked Bystander

I'm Yi Chen, an ace mercenary at the fifth Mortal Realm level with the Interstellar Universe Mercenary Company. I've completed countless Mortal Realm missions, and after passing through round after round of selection, I earned the chance to explore an Origin Star, an opportunity that comes once every cosmic era. I was brimming with confidence as I followed my teammates into the instance with our employer. Only then did I learn that, in this instance known by the local natives as "Earth," I was merely a shocked bystander...