East Asia is now experiencing significant economic growth and social change. Integration of East Asia seems an irresistible trend, as East Asian countries are closely interdependent with each other and share many common interests in economic development. This book analyzes the cooperation and challenges of East Asian countries in the process of integration. It includes 15 chapters in four sections. The first section discusses the impact of East Asia cooperation and economic integration. The second section emphasizes the election of political leadership in East Asia. The third section covers the topics of East Asian cultural identity, history and norms. The fourth section studies the relationship between East Asia and the World. The chapters are selected from two Trilateral symposia held in Seoul and Shanghai in 2013 and 2014, respectively. The Symposia offer comprehensive and diversified views of scholars from China, Korea and Japan.