Original: Chun Doo-hwan ( also transliterated as Jeon Du-hwan ; born January 18 , 1931 ) is a retired former ROK Army general who served as President of South Korea from 1980 to 1988 .
Simplified: Chun Doo-hwan ( born 18 January , 1931 ) was a Korean military officer and the President of South Korea from 1980 to 1988 .