Tengjanamu 431 is a book cafe in Busan that serves handmade tea, mulled wine, and a summer-only watermelon juice. The watermelon smoothie blends sweet watermelon with ice, and the iced jujube tea is served cold and sweet. Wi-Fi is available, and the men's and women's restrooms are separate; group visits and takeout are also possible. It is a quiet space, so loud talking is not allowed.