Littering in public areas presents a significant health and environmental challenge. This case study explores the use of design interventions to reduce such behavior and encourage social change. We focused on the trash disposal area in our school department, which has long been in state of disarray. Our goal was to modify user behavior through design, thereby maintaining cleanliness in the environment over the long term. Following the redesign and reconstruction of this space, we conducted a two-week experiment, utilizing camera footage to observe user behavior and surveys. Upon conclusion, a total of 72 responses were collected through an online questionnaire. Participants were asked to provide feedback on their experiences and perceptions regarding the redesigned trash disposal area. Further statistical analysis, including the McNemar Test, backward elimination logic regression, and independent samples t-test, was employed to assess the effectiveness of the overall trash disposal space planning and various design elements. From the results, we found a significant improvement in satisfaction and identified a design factor, posters featuring divine patterns and slogans, which significantly influenced user behavior. This study not only observed whether design could alter behavior and optimise the environment but also incorporated some clever ideas into the design to resonate with both teachers and students. We hope that even the simple act of disposing of trash can be enjoyable and that such designs will encourage the faculty and students of the design gallery to collectively maintain a clean and comfortable learning environment.