There are three general naming conventions you need to familiarize yourself with for proper citation in a modern context: European, Middle Eastern and East Asian.
(Primary Given Name) (Optional Secondary etc. Given Name[s]) (Family Name)
(John) (Mephistophiles) (Smith)
(Family Name) (Given Name)
In this case the Family name is usually 1 Chinese character, and the given name is 2 characters (even if the characters are no longer used as in Korea and Viet-nam). In Chinese, Korean, and Viet-namese that usually means one syllable per character, but in Japanese it varies wildly.
Many times the romanization of the East Asian names will join the given name with a hype (Won-Hwa) or have them as a single, unbroken word. However, sometimes they are broken apart, in two words, but they are still one name. When in doubt, Google the name you suspect to be the family name. If it is the family name, there will be lots and lots of people with that name. (Park is the most common name in Korea).
(Given Name) (Father's Given Name) (Grandfather's Given Name) (Tribal or Locational Name)
Sometimes the Fathers and Grandfathers given name is preceded by an article like 'bin' (Arabic), 'ben' (Hebrew), 'ibn' (Classical Arabic), or substituted for 'bint' or other female forms before the father's name if a woman. The locational name will almost always be preceded by the article, 'al'. The articles may be separated from the names by a hyphen or not, but when written should be included, but not usually when spoken unless in very formal circumstances.
(Mahmoud) bin (Hamid) bin (Abdul-Qadr) (al-Hashemi)
In a citation manager it should be entered as follow:
Following this table your entry should be:
Last Name = "Park", First Name = "Won-Hwa", Middle Name = ""