Am I the Protagonist?

Ye Xiaoxiu accidentally came to another world and opened the Tongtian system, but it seems that I am not the protagonist! A beautiful senior sister with a charm system, a sinister kendo senior brother, a little junior sister who keeps pets, and a "profound" master! Let's see how Ye Xiaoxiu reaches the top in one step, activates the Tongtian System, and defeats everything! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.