Hook-on ceiling system is one of the concealed grid suspended ceiling systems being widely used for interior application. The system is rigid, stable and dimensionally flexible. Installation is simple and efficient. The ceiling design can be done in a convex or concave shape with flat ceiling panels. The ceiling panels can be fabricated in various sizes, square in tile form or rectangular shape in plank form, depending on the ceiling layout design. Furthermore, the ceiling panel is fully de-mountable at any position without the use of special tools.