My Sister in the City Is a Time Traveler

My name is Yi Fan, and I have a very domineering older sister who is in the late stages of being a younger brother. Suddenly one day, my sister awakened the mark of time travel and became a time traveler. She can travel through all the worlds and carry the treasures, culture, and knowledge within them... The younger brother wants to sing, brainwash the divine song Little Apple, and ignite the square dance craze. My younger brother wants to write a book, Strange Fire Will, and Perfect World to become a classic. There is nothing you can't think of, nothing that your sister can't find. The author is not very good at writing introductions, so you should just start with the text! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.