A modular device adapted for subdividing room space, the modular device comprising: a panel comprising a corrugated portion positioned between a first planar surface and a second planar surface of the panel, wherein the peaks of the corrugated portion are in engagement with the first planar surface, wherein the troughs of the corrugated portion are in engagement with the second planar surface; the first planar surface and the second planar surface each having a first end (24, 25) and a second end (26, 27); wherein the first and second ends of the first planar surface are respectively opposite relatively to the first and second ends of the second planar surface; the second planar surface is parallel to the first planar surface; wherein the corrugations are parallel to the vertical axis of the panel; a concave female portion positioned along the vertical axis in the panel, wherein the concave female portion is formed from at least: the first end of the first planar surface, the first end of the second planar surface, and a curved portion from the corrugated portion; a convex male portion positioned along the vertical axis of the panel, wherein the convex male portion is positioned outside of the second end of the first planar surface and the second end of the second planar surface; wherein to extend the length of the panel, the convex male portion of a first panel is adapted to engage with the concave female portion of a second panel; and a corner portion comprising a female corner cap and an adjacent male part, the female corner cap having further a space between first and second sides, the adjacent male part joined to the female corner cap at the first side and space, wherein the female corner cap is adapted to engage with the male portion of the front panel, wherein the adjacent male part is adapted to engage with the female portion of the next panel; and wherein the adjacent male part is extended outwardly from an outer surface of the female cap at an angle relative to the longitudinal axis of the length of the panel. a panel comprising a corrugated portion positioned between a first planar surface and a second planar surface of the panel, wherein the peaks of the corrugated portion are in engagement with the first planar surface, wherein the troughs of the corrugated portion are in engagement with the second planar surface; the first planar surface and the second planar surface each having a first end (24, 25) and a second end (26, 27); wherein the first and second ends of the first planar surface are respectively opposite relatively to the first and second ends of the second planar surface; the second planar surface is parallel to the first planar surface; wherein the corrugations are parallel to the vertical axis of the panel; a concave female portion positioned along the vertical axis in the panel, wherein the concave female portion is formed from at least: the first end of the first planar surface, the first end of the second planar surface, and a curved portion from the corrugated portion; a convex male portion positioned along the vertical axis of the panel, wherein the convex male portion is positioned outside of the second end of the first planar surface and the second end of the second planar surface; wherein to extend the length of the panel, the convex male portion of a first panel is adapted to engage with the concave female portion of a second panel; and a corner portion comprising a female corner cap and an adjacent male part, the female corner cap having further a space between first and second sides, the adjacent male part joined to the female corner cap at the first side and space, wherein the female corner cap is adapted to engage with the male portion of the front panel, wherein the adjacent male part is adapted to engage with the female portion of the next panel; and wherein the adjacent male part is extended outwardly from an outer surface of the female cap at an angle relative to the longitudinal axis of the length of the panel.