Does the subject want to ask "What is the relationship between the bookstore owner and Zhang Wansen"? An acquaintance. Zhang Wansen often goes to the bookstore to borrow books, thus getting to know the bookstore owner. Zhang Wansen is from the TV series twinkling star, in which he plays the leading role. "Twinkle, twinkle, bright star" tells the story of Lin Beixing accidentally deleting the text messages of her old mobile phone and going back to the past, thus getting to know Zhang Wansen, a former stranger, and starting a wonderful journey to save time and space.