A display device, comprising: a display unit; and an attachment unit configured to attach the display unit to a surface, wherein the display unit comprises: a display panel; and a back cover placed at a rear of the display panel and including at least one opening formed in the back cover, wherein the attachment unit comprises: at least one hook configured to be placed on an area of the surface and to be inserted into the at least one opening of the back cover, wherein the attachment unit is magnetically coupled with the display unit, and wherein the at least one opening formed in the back cover includes two openings formed at an upper portion of the back cover and arranged in a first direction, and the at least one hook of the attachment unit includes two hooks configured to be placed in areas of the surface corresponding to the two openings formed in the back cover and to be inserted into the respective openings in the back cover, wherein the first direction is from left to right or from right to left, characterized in that the attachment unit further comprises at least one coupling unit configured to be placed in an area of the surface corresponding to a bottom portion of the display unit and to be coupled with the back cover of the display unit, and wherein the at least one coupling unit is elongated in the first direction. a display unit; and an attachment unit configured to attach the display unit to a surface, wherein the display unit comprises: a display panel; and a back cover placed at a rear of the display panel and including at least one opening formed in the back cover, a display panel; and a back cover placed at a rear of the display panel and including at least one opening formed in the back cover, wherein the attachment unit comprises: at least one hook configured to be placed on an area of the surface and to be inserted into the at least one opening of the back cover, wherein the attachment unit is magnetically coupled with the display unit, and wherein the at least one opening formed in the back cover includes two openings formed at an upper portion of the back cover and arranged in a first direction, and the at least one hook of the attachment unit includes two hooks configured to be placed in areas of the surface corresponding to the two openings formed in the back cover and to be inserted into the respective openings in the back cover, wherein the first direction is from left to right or from right to left, at least one hook configured to be placed on an area of the surface and to be inserted into the at least one opening of the back cover, wherein the attachment unit is magnetically coupled with the display unit, and wherein the at least one opening formed in the back cover includes two openings formed at an upper portion of the back cover and arranged in a first direction, and the at least one hook of the attachment unit includes two hooks configured to be placed in areas of the surface corresponding to the two openings formed in the back cover and to be inserted into the respective openings in the back cover, wherein the first direction is from left to right or from right to left, characterized in that the attachment unit further comprises at least one coupling unit configured to be placed in an area of the surface corresponding to a bottom portion of the display unit and to be coupled with the back cover of the display unit, and wherein the at least one coupling unit is elongated in the first direction.