The "10000 won"

The "10000 won (만원)", the correct pronunciation is "man won".
In the front is the bill is Sejong the Great (세종대왕), he was the fourth king of Joseon Dynasty. He created the Hangul (한글), which is the alphabet of Korea. Behind the king is Irworobongdo (일월오봉도). Irworobongdo is the king's royal trhone of the Joseon Dynasty.
On the back of the bill is the Honcheonsigye (혼천시계), an astronomical clock of South Korea and the Cheonsang Yeolcha Bunyajido (철상열차분야지도), a map of the stars of Korea.