Refit is a finger rehabilitation device focused on the intrinsic connection between the brain and the hand, designed to support sustainable recovery in everyday life. We envisioned a rehabilitatio process that does not add to the user's stress. To achieve this, we moved away from the cold, clinical look of traditional medical devices. Instead, we adopted a geometric aesthetic featuring a "Gentle Arc" form that naturally embraces the hand. By combining warm design to alleviate psychological burden with precise engineering to delicately awaken stiff muscles, Refit Hand transforms rehabilitation from a strenuous regimen into a comfortable, intuitive part of daily life.