Firstly, I wanted to create a mobile application that improves the quality of women's daily lives. I had to think about the target audience, the purpose of the application, and the proper design that would suit the concept. Then I thought of the MBTI psychological test, which is popular among the MZ generation in Korea (a pairing of two groups—Millennials and Generation Z— these days. The MZ generation is active in expressing themselves and tries to identify what type of person they are and show themselves on social media. Therefore, MZ generation women can find out who they genuinely are through this application and care of themselves. In this application, the main character is "Ms. Buddy" and she collects user data every day through daily and personal questions. It builds intimacy with users by asking them various types of questions such as "What are some things that make you nostalgic?" and "What kind of snack are you craving for before the menstruation?" This helps it easier and faster for users to understand their tastes and personalities and provides a medium for MZ generations who are still confused about who they are and what they like.