Hanok is a term to describe Korean traditional houses. Korean architecture lends consideration to the positioning of the house in relation to its surroundings, with thought given to the land and seasons.
The interior structure of the house is also planned accordingly. This principle is also called Baesanimsu (Korean: 배산임수; Chinese: 背山臨水), literally meaning that the ideal house is built with a mountain in the back and a river in the front, with the ondol heated rock system for unique heating system of South Korea during cold winters and a wide daecheong (대청) front porch for keeping the house cool during hot summers.
Houses differ according to region. In the cold northern regions of Korea, houses are built in a closed square form to retain heat better. In the central regions, houses are 'L' shaped. Houses in the southernmost regions of Korea are built in an open 'I' form. Houses can also be classified according to class and social status.
Paleolithic stayed in the cave or made temporary house. In Neolithic era, the temporary house developed into a dugout hut. They dug the ground with small shovel and built small house which used rafter, column. Woods was used for rafter and column, straw was used for roof. In Bronze Age, there were several columns in the house, so the area of house was extended rather than neolithic house. Iron Age's house had Ondol so house had heating system from that time. The house also used Giwa, a kind of roofing tile which was made with baked soil. By using Giwa roof tile, hanok got to have its own specific shape.
The time of enlightenment
After or during the time of enlightenment, lots of foreginers visited, stayed and lived in Korea. For this reason, Christianity was peppered throughout in Korea. Especially, Anglicanism, Catholic tried to be naturalized. So they built their church using Korean traditional architecture. This church is located in Ganghwa County, Jincheon County, Cheongju, During Korea under Japanese ruletime, Hanok used to be called 'jooga' or 'house of joseon'. There was a record about hanok, however the specific terms of hanok, hasn't used prevalently.
From 1970s, the old architects learned today's architecture, they aware hanok as an old day's antiquated and inefficient architecture and demolished down so lots of hanok's historical value has been dissappeared. However, the value of hanok has been highlited from 2000s the efficient of hanok's eco-friendly function and healing effectiveness has been emphasized. Today, the number of people who tries to move in hanok is growing rapidly to cure the diseases such as atopy, asthma which are mainly caused by environment. In Korea, hanok takes only 0.77% in whole buildings(2008). Recently, many other places try to follow the designs like hanok's gentility such as in public places;bathroom, signs and even private places;cafe. Today, some train stations are built in hanok design. (Jeonju station is famous)
In Gaesung, the traditional hanoks are originally there and take a role sort of tourist attraction. Kiwajibs are surrounding the hanoks.
In east-north China, hanoks also can be found and Josunjoks are living in hanoks building for themselves over 100 years. Also, from 2010, people are on project making hanok village in Heilongjiang, China.
According to old paper about house in April 23 of 1907, the terms that Hanok appeared on the history for the first time. In that paper, Hanok was figure out the specific region where Jeong-dongroad, from Donuimun to Baejae school. At that time, instead of using Hanok, terms like 'Jooga'(It means living houses), 'Jaetaek'(It means all kinds of house) were used widespread.So 'Hanok' was only used special circumstance when latest house was built in somewhere. When era of Korea under Japanese rule, the ruler used terms such as 'Jooga' 'Joseon House' when they were talking about house improvement.
The specific word, Hanok, appeared on Samsung korean big dictionary on 1975, it defined as antonym of western house and synonym of Joseonhouse, house of korean style. After 1970's, with urban development lots of Apartment, Row House was built in south korea, Hanok was disappeared in every town. From that time, hanok only called korean traditional house. 
The environment-friendly aspects of traditional Korean houses range from the structure's inner layout to the building materials which were used. Another unique feature of traditional houses is their special design for cooling the interior in summer and heating the interior in winter.
Since Korea has hot summers and cold winters, the 'Ondol (Gudeul),' a floor-based heating system, and 'Daecheong,' a cool wooden-floor style hall were devised long ago to help Koreans survive the frigid winters and to block sunlight during summer. These primitive types of heating and air-conditioning were so effective that they are still in use in many homes today. The posts, or 'Daedulbo' are not inserted into the ground, but are fitted into the cornerstones to keep Hanok safe from earthquakes.
The raw materials used in Hanok, such as soil, timber, and rock, are all natural and recyclable and do not cause pollution. Hanok's have their own tiled roofs (Giwa), wooden beams and stone-block construction. Cheoma is the edge of Hanok's curvy roofs. The lengths of the Cheoma can be adjusted to control the amount of sunlight that enters the house. Hanji (Korean traditional paper) is lubricated with bean oil making it waterproof and polished. Windows and doors made with Hanji are beautiful and breathable.
The shapes of Hanok differ regionally. Due to the warmer weather in the southern region, Koreans built Hanok in a straight line, like the number 1. In order to allow good wind circulation, there are open wooden floored living area and many windows. The shape of the most popular Hanok in the central region is like letter "L" or Korean letter "ㄱ", an architectural mixture of the shapes in the northern and the southern regions. Hanoks in the cold northern region, are box-shaped like Korean letter "ㅁ" so that it would be able to block the wind flow in building Hanoks. They do not have an open wooden floored area but the rooms are all joined together.
The structure of Hanok is also classified according to social class. Typical yangban (upper class) houses with giwa (tiled roof) emphasized not only the function of the house, but also possess great artistic value. On the other hand, the houses of the commoners (as well as some impoverished yangban) with choga (a roof plaited by rice straw) were built in a more strictly functional manner.
Many hanoks have been preserved, such as:
- Bukchon Hanok Village, a residential quarter in Central Seoul
- Namsangol Hanok Village in Pil-dong neighborhood of Jung-gu in Seoul
- Hahoe Folk Village, a traditional village from the Joseon Dynasty located in Andong, Gyeongsangbuk-do.
- Yangdong Folk Village, a traditional village from the Joseon Dynasty in Gyeongju, Gyeongsangbuk-do, South Korea, along the Hyeongsan River.
- Korean Folk Village, a tourist attraction in the city of Yongin, Gyeonggi
Sungjosin, Samshinhalmi (one who gives birth to women), Kitchen God etc believed by people that there are different kinds of gods related to the house of each enrollment.
2018 Winter Olympics will be held in Pyeongchang County. Not only olympic games but also other amusemnet facilities will be prepared for tourists. Hanok is one factor that prepare as a traditional house of South Korea. 
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- YEON, CHOUL-WOON. "2018 Winter Olympics Spotlight: Cook and Experience the Korean Traditional Foods". koreaittimes.
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