Unbelievable advancement of science and technology brings not only convenience in life but also spare time concomitant with high diversification in human needs. Mainstream areas cannot always fulfill these diversified needs of contemporary people. While most human beings who are benefit from it naturally have a firm belief in the mainstream areas which they can't like without.
Now that mainstream areas is not enough to satisfy diversified needs, people sometimes find a peace in nonmainstream areas. It is a custom of long standing in Korea, the "Four Pillars" (the year, month, day and hour…
