Park Young-Guk is the father of Kim Young-Guk. He is also a contact of Derrick McReary, who he entrusted to protect Kim when he came in the country with a load of fake hundred dollar bills. Along with him came Niko Bellic, who also later killed Kim on orders of Jon Gravelli.
Due to Korean naming conventions, the family name precedes the given name. Although both Kim and Park are common Korean family names, Rockstar's developers overlooked the correct name order, resulting in both Park and his son having the same given name, but different family names.