<p>With the growth of digital technologies and artificial intelligence, human existence is expanding into four interconnected spaces: physical (natural), social, thinking, and cyber. The interplay of these four spaces is reshaping the relationships between humans and nature, society, their inner selves, and the cyber world. The traditional tripartite philosophical system of Eastern culture (Daoism, Confucianism, and Buddhism) faces new challenges in explaining human existence and its relationship to these fundamental living spaces in the digital age. This paper proposes a new quadri-philosophical system, “Daoism, Confucianism, Buddhism, and Cyberism" based on the Cyber-Physical-Social-Thinking space. In this new system, Cyberism emerges as a new philosophical domain dedicated to exploring the relationship between humans and the cyber realm, including its existence and space, and responding to ongoing transformations in human life in the digital age. Specifically, this paper analyzes the new forms of existence and space, philosophical logic, and new applications and philosophical problems for each of the four philosophical dimensions, examining the contemporary relevance of Eastern philosophy in the context of digital society. This research seeks to contribute to ongoing discussions on Eastern philosophy and offers an interdisciplinary perspective for reflecting on the impact of emerging technologies on human existence.</p>