Yuegang Liu is a senior secondary-school art teacher and Vice Principal of Sun Yat-sen University Affiliated School in Shenzhen. Over more than 20 years in education, he has worked on school culture, brand and design management, and AI-supported collaborative learning. He developed the Three-Person Learning Group model, combining Confucian differentiated instruction with Vygotsky's zone of proximal development through intelligent grouping, collaborative inquiry, and multidimensional assessment.