6. Traditional Hanok House_ Chogajip straw-roofed house Korea’s traditional Hanok housing emphasizes harmony with nature. Hanok buildings were built of natural materials, such as wood, soil, and stone, with careful consideration not to damage the surrounding natural landscape. The interior, including walls, floors, and windows, was finished with Korean traditional paper called Hanji. Chogajip or straw-roofed houses were inhabited by commoners.