FTP, name this dynasty that ruled Korea until annexed by Japan in 1910.
During this dynasty, a Catholic scholar developed a philosophy of the rights of the people that is classified as part of the "practical learning" modernization movement known as Silhak.  Its fourth ruler is credited with developing the official writing system of fourteen consonants and ten vowels, replacing the hanja system.  It was formed after in the late 14th century when an opportunity to invade China was passed over by King U's general in favor of overthrowing the Goryeo.  FTP, name this dynasty that ruled Korea until annexed by Japan in 1910.
During this dynasty, a Catholic scholar developed a philosophy of the rights of the people that is classified as part of the "practical learning" modernization movement known as Silhak.  
Choson or Joseon or Yi Dynasty