"Tai.ONE"combines Taiwan and One, symbolizing the uniqueness of the mobile mail van in Taiwan. This van shuttles back and forth between the valleys.For decades, it has grown together with the residents and established a deep companionship.It not only brings letters and supplies from the outside world, but more importantly, endless care and warmth. The book covers the humanistic sentiments of Taiwan’s only mobile mail van in depth, and promotes its story to more people, making them understand its importance to the locals and their attachment to it, which is a way to preserve the cultural asset.