<b>The Ontology of Subjecthood and Presence: Toward a Rigorous Conceptual Framework</b>

This is the updated and revised version of the article, with the key positions and conceptual framework retained.This paper proposes a hierarchical metaphysical model of subjecthood grounded in the concepts of Presence and the Ground (Logos). The model categorically excludes all non-human entities (including AI and animals) from the possibility of genuine subjecthood, establishing human existence as uniquely relational to the transcendental Ground (Heidegger, 1997; Descartes, 1994; Kant, 2002). The paper clarifies the connections between metaphysical categories and contemporary scientific and philosophical theories to reinforce the model’s conceptual coherence.<b>Methodology</b><br>This study was conducted by an independent researcher unaffiliated with any academic or research institution. Artificial intelligence tools were employed for content development, refinement, and cross-verification: ChatGPT 4.0, ChatGPT mini, ChatGPT 3.5 (OpenAI), DeepSeek (DeepSeek AI), and Grok 2.0 (xAI).The author formulated the research concept, hypotheses, and key questions, while AI tools were used as supportive aids for structuring content and identifying arguments. Outputs from different models were cross-checked, edited, and validated by the author.<b>Limitations</b><br>AI may contain inaccuracies or outdated information and does not replace traditional research methods. To minimize these risks, the author applied multi-level cross-checking among models, editorial refinements, and author-led verification.<b>Author Information</b><br>The author is an independent researcher using AI solely as a supportive analytical and editorial tool, maintaining full control over interpretation and conclusions.