Hanok Stay refers to staying in a traditional Korean house. It is a good opportunity to experience traditional Korean lifestyle and culture. The traditional houses available for hanok stays are decades to hundreds of years old. They have been somewhat renovated for the convenience and safety of its guests, but the traditional Korean style and sentiment are still retained.
The number four is considered unlucky. It is treated the same way as the number 13 in western countries -- no 13th floor, etc. This stems from the Korean syllables derived from Chinese characters. Two of those, 四(four) and 死 (death), are pronounced the same - 사 (sah). Hence the “F” (for Fourth) instead of “4″ in elevators or skipped entirely.