Geulwol is a cafe in Yeonhui-dong, Seodaemun-gu, Seoul, where visitors buy letter paper, browse books, and use a pen pal service. It is a space for writing handwritten letters, and visitors can join a letter-writing session addressed to themselves or exchange letters with a stranger. The interior is quiet, which suits writing letters and organizing thoughts, and visitors can look through letter paper and books together. Writing a handwritten letter takes time because you note down what to say, arrange the sentences, and then copy them over.