While modern man enjoys comfort in this technologycentered society but simultaneously, may fall into minorities isolated and suffered from technology. Jongjun Son designed a kind of defensive prosthesis to help those who find themselves socially disadvantaged take a ‘self-defensive measure.’ This defense equipment, such as an armor and helmet made out of metals, sponge, etc., shows the merger of humans and machines. In some respects, digital media including a computer and a smartphone may have already heralded the bond between our body and machine. The artist asks a question about how man and machine form a relationship in the social environment including the technological one. Are we experiencing the extension of the self through the combination with machines? Or, are we increasingly becoming self-closed and isolated?