There's one you can take free and anonymous HIV test in Kwang ju.
please refer to the attachment.
I translated name of the subway stations but I am not sure if it's accurate.
HIV testing service for foreigner is offered by KHAP in Seoul and Ansan city but they are too far.
This center's staff can not speak Enlgish though.
but at least you can take test here.
if you need counseling, please call to 02-972-4327 or 031-495-0560.
or, if you can not communicate with the staff there you can also call to 031-495-0560 for translation.
have a good day .