Original sentence: A closer-in-bloodline royal Prince exists, Prince Yi Gu, but is considered not a valid heir, having married a Japanese woman.A living descendent of the Joseon Dynasty, His Imperial Highness, the Crown Prince Yi Seok remains, despite occupying Japan's efforts to assimilate and end the pure Korean royal dynasty.It was officially founded by Yi Seonggye, the leading General of the Armed Forces during the overthrow or coup d'etat of the last king of the Goryeo Dynasty.The 600-year-old dynasty came to an end with Japanese invasion and internal betrayal and treason.The House of the Junju Yi-Shi, The Royal Family of the Joseon Dynasty, or Ishi Wangjo, was the final ruling Imperial dynasty of Korea, lasting from 1392 until 1910.The Joseon Dynasty is usually preceded with the title "Great" (Chosun or Choson)
Edited sentence: A living descendent of the Joseon Dynasty, His Imperial Highness, the Crown Prince Yi Seok remains despite Japan's past efforts to assimilate and end the pure Korean royal blood line.A more closer-in-bloodline royal Prince exists, Prince Yi Gu, but his preceding father Crown Prince married a Japanese woman, thus making him impure.Officially founded by Yi Seonggye, the leading General of the Armed Forces during the overthrow or coup d'etat of the last king of the Goryeo Dynasty.The 600 year old dynasty came to an end with the Japanese invasion and political manipulation backed by internal betrayal and treason.The Joseon Dynasty usually prefixed with the title "Great"(also known as Chosun or Choson), the House of the Junju Yi-Shi, The Royal Family of the Joseon Dynasty, or Ishi Wangjo, was the final ruling Imperial dynasty of Korea lasting from 1392 until 1910