☆Changho(traditional window) accounts for a very high proportion of Korean architecture. In particular, most of the walls of palaces are treated with changho. Therefore, Korean changho is an important factor in determining architectural designs, and they are of many types and sizes, requiring advanced techniques and techniques.
Therefore, to make traditional Korean windows, skilled craftsmen(changho-jang) with many years of experience are required. Changho-jang is classified as a somok-jang, because somok-jangs are in charge of decorative parts while daemok-jangs are in charge of the structural parts of the building.
Changho-jang has become an essential part of increasing perfection with its delicacy.

Lee Jong-han, the holder, has been engaged in changho production since 1963, and is recognized as having related functions by participating in repairing changho's of many historical sites' including the Hapcheon Haeinsa Temple, Yecheon Yongmunsa Temple.

The value of protection is high, such as the fact that there are only a few windows nationwide that produce windows essential to traditional architecture and that the foundation for transmission is relatively difficult due to low profitability.