Rental Friends Seoul Guidebook by b/o/o/k/e/u/b/o/o/k/e/u started from the playful question, “What if the three members of b/o/o/k/e/u/b/o/o/k/e/u became your rental friends?” This guidebook introduces the secret and amusing places the three members have cherished across Seoul. After purchasing the book, readers can contact the members to accompany them to their selected spots from the guidebook.