Today I went to Blacksmith's workshop in Gogureo. and I learned about Gogureo. Gogureo established by Jumong . later king sosurim established national university 'Taehak" and King Gwanggaeto,he congquered many countries. and his son King Jangsu get large territory into manchuria in north, Han river in south. and Gogureo battle with sui at salsu. It's called'great victory at Salsu' after the two fight Gogureo weaker. Today is very interesting time.