Service learning, a critical pedagogy combining community service with academic goals, fosters civic engagement, practical skill development, and social responsibility. This chapter explores how integrating Gen AI can enhance project-based service learning to address real-world social challenges in higher education (HE). Despite its rapid growth in HE, Gen AI still faces limitations, particularly the lack of a human-centred design method that reflects real-world contexts and the risk of oversimplifying complex tasks, leading to a more automated, less humanised learning process. The DEEP method, structured upon four co-designing phases—direction, education, event, and project—offers a hybrid solution, creating an adaptable and scalable framework for constructing a project with Gen AI for co-designed, social, and personalised learning. The chapter also illustrates the LivePBL project, piloted to train pre-service teachers in China, demonstrating how the method can effectively integrate Gen AI with hands-on co-design to enhance the learning environment and societal exchange.