The present invention relates to an untearable window paper made of Korean paper, capable of solving a problem in that the conventional window paper made of Korean paper does not meet all the requirement characteristics, such as durability, water resistance, heat insulation, lighting property, and sealing property, for a modern window paper in an interior space, thereby improving water resistance, durability, and functionality of the Korean paper as the window paper and thus enhancing the paper quality, whereby the window paper cannot be easily torn by wind and rain. Further, the present invention relates to a high-strength multi-functional window paper made of Korean paper, wherein the window paper is modified to ameliorate problems occurring when the window paper is formed of only Korean paper and to enhance the flexibility and the tensile strength to retain morphological stability, thereby meeting all the requirement characteristics, such as heat insulation, heat reserving property, lighting property, and anti-bacterial functionality, which are required for a modern type window paper, and thus exhibiting functionalities and soft-colored patterns, which are advantages of the modern type window paper, so, the window paper, when being attached to a window or a frame of a sliding door, simultaneously meets the beauty of traditional windows exhibiting natural and luxurious classical beauty, thereby overcoming the limits of the use of traditional Korean paper.
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