Gu Yu found a book she had never seen before in her grandfather's old bookstore. The cover showed a street scene she had never seen before. When she turned the page and ran her fingertips over the yellowed words, she was sucked into a completely unfamiliar era. On the street in the 1940s, she met Li Yanlin, who had the same face as her grandfather when he was young. However, Li Yanlin was wary of her, thinking that this woman with weird clothes and strange words was an enemy spy.
