Have you ever experienced local tangerine farms in Jeju Island, South Korea? Many visitors travel to Jeju Island to enjoy its natural beauty and coastline. Bong is an AI bot and your tangerine farm booking agent. The name "Bong" is inspired by a type of tangerine called "Halla-bong," Jeju's representative fruit. The app's primary purpose is to allow tourists to enjoy Jeju and support local farmers economically by promoting sustainable tourism and agritourism. The target audience includes both locals who have tangerine farms and tourists who want to travel to Jeju. When a user signs up for the app, they create their own custom tangerine avatar that serves as the main interface for the app.Based on the research, most tourists in Jeju come from different countries, so they don't have a chance to communicate directly with the locals because of the language barrier. Bong helps you chat with locals and other users through auto-translation. Many local farm owners want to promote their tangerine farms and products to satisfy consumers' tastes and expectations. Bong provides specific information about local farms, local products, and outdoor activities. Users can make reservations about farm activities by discovering local farms. This app will help tangerine farm owners financially and allow tourists to have memorable experiences in Jeju Island.