On the phone, our app list is surrounded by an extremely rich variety of brands. Internet products, even young brands in traditional industries, are agitating and appearing in a "new" and "fresh" posture. Used books? Dejavu? At the stage of getting to know it, of course, it will also be attracted by its easy and professional online sales and purchase form. After experiencing fast and interesting second-hand book transactions in real life, it is also a long-lost feeling. This time, friends who catch more fish should make an out-of-the-box "nostalgic space" to carry out offline communication with its many book friends. We try to remove the redundant "design sense" and use the most clumsy The simple design language gives this space a comfortable experience of real panning.