I went to the national museum of Korea. The first period was Paleolithic period. In the Paleolithic period, the people lived in the cave and hunted for food.

     The second period was Neolithic period. For Neolithic period, com pattern pottery is one relic. The com pattern pottery has com pattern similar to their dream.

     The third period is bronze age. In the bronze age, they used bronze.

     Then I saw Gojoson, the first kingdom of Korea. Dan-gun-wang-gum established Gojoson. And the theory of Gojoson was the tiger and the bear came to Hwan-ung and said make them to human. The Hwan-ung gave the mugwort and garlic and said eat this and live in cave for 100days. But the tiger ran out. On the other hand, the bear did it and became a woman for 21days. So ung-nue(the bear) married with Hwan-ung. Hwan-ung's son is Dan-gun-wang-gum who established Gojoson.

     The next period was the three kingdoms. Go-gu-rue was established by Ju-mong, Backjae was established by On-jo(who is Ju-mong's son), and Shinla was established by Park-haek-geo-se.

     Then I saw Ga-ya next, established by Kim-su-ro. Ga-ya had a good iron making technology.

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