Happily was E-2;
am now F-1.
It's good for two years and multi-entry.
Worth noting is that the old address system is not used by government offices any longer. Even though I gave the address I've used for three years, the one printed on the back of my ARC card corresponds to the new street name and building number. My villa number remains the same.
Last year Korea standardized addresses nationwide, affording each street a name. Before that, Koreans relied on building numbers assigned to places within neighborhoods, within districts, within cities to find people. It could be difficult. Blue street signs and blue building placards appeared almost overnight. It appears we can begin using them for official things like mail. Probably always could, but you never know.
So my address is now:
[Street Name]로26가길 70-0 B3호 (Street Name +Street# +Building# + Unit#)
It's simpler. I like it. Easy to find people anywhere in this maze of a city.
With an appointment and all the paperwork handy, the Visa process isn't too difficult here. I stress appointment. My replacement at my high school spent what sounds like a few hours at immigration without an appointment. And the school made him go the day all his fellow newbies to Korea were certain to show up with their new colleagues to wait. Bad idea.
Other great thing about this F-1. No testing. None.