A method for producing reinforced glass, the method comprising: providing a base including glass; applying a coating composition on the base; heating the base and the coating composition; and quenching the base and the coating composition, wherein: the coating composition contains P 2 O 5, Al 2 O 3, B 2 O 3, ZnO, I group-based metal oxide and II group-based metal oxide, wherein P 2 O 5 is contained in an amount of 35 to 55% by weight based on a total weight of the coating composition, wherein Al 2 O 3 is contained in an amount of 5 to 35% by weight based on the total weight of the coating composition, wherein the I group-based metal oxide is contained in an amount of 5 wt% to 40 wt% based on the total weight of the coating composition, wherein B 2 O 3 is contained in an amount of 5 wt% to 10 wt% based on the total weight of the coating composition, wherein ZnO is contained in an amount of 1 wt% to 5 wt% based on the total weight of the coating composition, wherein the II group-based metal oxide is contained in an amount of 1 wt% to 10 wt% based on the total weight of the coating composition. the heating of the base and the coating composition is performed at a temperature lower than or equal to 700 degrees C. providing a base including glass; applying a coating composition on the base; heating the base and the coating composition; and quenching the base and the coating composition, wherein: the coating composition contains P 2 O 5, Al 2 O 3, B 2 O 3, ZnO, I group-based metal oxide and II group-based metal oxide, wherein P 2 O 5 is contained in an amount of 35 to 55% by weight based on a total weight of the coating composition, wherein Al 2 O 3 is contained in an amount of 5 to 35% by weight based on the total weight of the coating composition, wherein the I group-based metal oxide is contained in an amount of 5 wt% to 40 wt% based on the total weight of the coating composition, wherein B 2 O 3 is contained in an amount of 5 wt% to 10 wt% based on the total weight of the coating composition, wherein ZnO is contained in an amount of 1 wt% to 5 wt% based on the total weight of the coating composition, wherein the II group-based metal oxide is contained in an amount of 1 wt% to 10 wt% based on the total weight of the coating composition. the heating of the base and the coating composition is performed at a temperature lower than or equal to 700 degrees C. the coating composition contains P 2 O 5, Al 2 O 3, B 2 O 3, ZnO, I group-based metal oxide and II group-based metal oxide, wherein P 2 O 5 is contained in an amount of 35 to 55% by weight based on a total weight of the coating composition, wherein Al 2 O 3 is contained in an amount of 5 to 35% by weight based on the total weight of the coating composition, wherein the I group-based metal oxide is contained in an amount of 5 wt% to 40 wt% based on the total weight of the coating composition, wherein B 2 O 3 is contained in an amount of 5 wt% to 10 wt% based on the total weight of the coating composition, wherein ZnO is contained in an amount of 1 wt% to 5 wt% based on the total weight of the coating composition, wherein the II group-based metal oxide is contained in an amount of 1 wt% to 10 wt% based on the total weight of the coating composition. wherein P 2 O 5 is contained in an amount of 35 to 55% by weight based on a total weight of the coating composition, wherein Al 2 O 3 is contained in an amount of 5 to 35% by weight based on the total weight of the coating composition, wherein the I group-based metal oxide is contained in an amount of 5 wt% to 40 wt% based on the total weight of the coating composition, wherein B 2 O 3 is contained in an amount of 5 wt% to 10 wt% based on the total weight of the coating composition, wherein ZnO is contained in an amount of 1 wt% to 5 wt% based on the total weight of the coating composition, wherein the II group-based metal oxide is contained in an amount of 1 wt% to 10 wt% based on the total weight of the coating composition. the heating of the base and the coating composition is performed at a temperature lower than or equal to 700 degrees C.