OVERVIEW: The Incheon-class frigates, also known as the Future Frigate eXperimental or FFX during development, are coastal defense frigates of the Republic of Korea Navy. 

DETAILS:The Republic of Korea Navy initially wanted twenty-four 3000 ton frigates to replace the Ulsan-, Pohang- and Donghae-class coastal fleet of 37 ships. It was later decided that six 2700 ton ships will be constructed for the first batch. In 2008, the plan was further downgraded to 2300 tons with the number of ships for the first batch down to six.  

SOURCES: Wikipedia, the Free Encyclopedia. "Incheon-class Frigate - Wikipedia." n.d. Accessed September 8, 2017. https://en.wikipedia.org/wiki/Incheon-class_frigate. 