This HCI Companion Day #7 is the first public demo day and seminar in 2026, where talents grown through learning and projects in the HCI field introduce the results of their 고민 (deliberations) on AI UX in a demo day format. Specifically, this demo day focuses on AI companions that can be encountered in daily life, explaining four projects that have considered everyday AI companions that solve life's problems, and sharing insights necessary for human-centered user experience design in creating AI products. The event includes networking and dinner, an opening and introduction to Companoid Labs and CIT, special projects on AI companions changing daily life and collaboration, and a special lecture and fireside chat with Dr. Park Do-eun on "The Power of Understanding People in the AI Era: From HCI Research to AI Services."