The article centers on the importance of considering diverse users in the design process. By starting with the concept of a "reference user," designers often default to assumptions that reflect the average person—someone who walks, sees, and hears without limitation. This can unintentionally exclude those with disabilities or different needs. The workshop conducted with the Korea Disability Arts & Culture Center flipped this approach, prompting participants to think about how various physical limitations affect daily activities, like tying shoelaces or using gym equipment. Through this exercise, participants identified "reference users" and the groups they exclude. For instance, when analyzing backpacks, they recognized that not everyone can use them due to mobility issues. The process involved pinpointing everyday products, defining who gets left out, and exploring the reasons behind these exclusions. Participants then focused on specific issues, such as accessibility in ticket booking systems for older adults or low-income individuals without smartphones. The emphasis on understanding users' needs highlighted the desire for independence in tasks that many take for granted. Creating detailed user personas became a key strategy in grasping the emotional and psychological barriers faced by these excluded groups. Instead of multiple superficial personas, teams developed one in-depth persona, such as a young wheelchair user at a fitness center or an older adult struggling with technology. This focused approach allowed for a deeper understanding of user experiences and informed design decisions. By mapping out the user journey, the workshop participants gained insights that can lead to more inclusive and effective design solutions.