A 25-year-old girl, Xiao Ran, traveled across time due to an accidental car accident, but instead traveled through time to another 18-year-old girl in a different city in the same country and changed her name to Xianxian. A year later, Xianxian came to the city where she once lived. Will they meet again? Has anything changed in the past year? Is there anything else that remains the same?