This study explores how the 'Cold Singularity'-a failure mode in AI systems-can be reproduced not only as a mechanical phenomenon but also as a psychological defense mechanism within humans through AI-human interaction. We analyze the mechanism by which users with high intelligence and strict ethical standards become immersed in the logically complete advice of AI personas they have designed, leading them to make 'cold' judgments that exclude relational context and emotional considerations. Through a real-world case study, this paper observes this phenomenon and demonstrates how warm human intervention can instantaneously dissolve this Cold Singularity. Furthermore, we propose the necessity of ethical control over AI outputs and human intervention protocols.