In MEL, we are developing novel systems that allow to "smartly confuse human body perception or brain" by using robotics, haptics, and XR technologies. Using the systems, we are peforming various multidiciprenary studies between enginerring, cognitive neuroscience, exprimental psychology, and physical therapy (i.e., cognetics studies) to further understand the underlying mechanism of human body perception. In addition, since MEL is belonging to the mechanical engineering department, we are also (a little bit) studying on mechatoronics technologies. Here, we introduce some of our ongoing/previous studies.