I can't really tell you what I had to do to get my wife here without talking about what I had to do. So, get some coffee. This will take awhile.
Item #0 was my E-2 visa. You diploma is needed. There are two routes to go:
a) Your embassy needs to "notarize" your diploma and possibly transcripts. The U.S. Embassy doesn't do this. Americans need to have the university do its thing, then the state takes its turn, then the U.S. State Dept. finally gives its blessing. Then the Thai Embassy in the U.S. gets into the act, and you are ready to go. Allow a month for this. (Very optimistic figure.) The embassy's info is not really all that helpful, and if you don't have somebody helping you out in country, your chances of success aren't too good.)
b) The school sponsors you. You still need to provide the diploma and transcripts. The transcripts cannot be more than three months old, as I learned.
This is in contrast to the procedure several years ago, when the diploma went to Seoul, and then back to the embassy/consulate where you were applying for the visa. The rocket scientists in Cairo in 1997 took my application for a toruist visa along with my diploma. Nothing I could say or do conveyed what an incredibly stupid thing they were doing. Bangkok seemed to know what they were doing. Still, if you're not applying in California or Canada, I'd be very diligent while applying.
On to my wife:
Korea and Thailand have a "no visa" protocol. In practice, however, it's a bit more complicated (and a lot more expensive) than that.
First, we needed to be "really" married (i.e., have the marriage registration from Thailand).
Second, we had to have the Thai Foreign Ministry (inconveniently located on Chiang Wattna (pardon my crappy spelling) stamp it. We needed two copies at 400 or 800 baht a pop, and it's double for "while you wait" service.
Third, the Korean Embassy needed to add their stickers.
Fourth, she needed a return ticket to enter Korea. (A one-way ticket was okay for me.)
(I blundered. I got a three-month return because it was cheaper than a one-year open return. Unknown to me at the time was that the return leg on the one-year ticket can be refunded [minus a 2,000 baht fee] and the same leg on the three-month ticket cannot be refunded.)
She was then able to enter Korea along with me as my wife on the strength of my E-2 visa. She got three months, my "until" date was left open. My heart stopped as immigration brought her up on their computer terminal. I got the hairy eyeball as she (the official) asked the relationship of "that woman" to me and seemed surprised to learn that she was my wife. But, everything must have been in order because I was told that she had to extend her stay within three months and I was back (with wife!).
When I went to get my Korean Alien Registration Card, she also got hers. At the time, her tourist visa was changed to an F-3 visa. I paid 10,000 won for my card. I had to supply the contact info for my university so that Korean immigration could verify my diploma again.
My wife's card was 60,000 won. I assume that the extra 50,000 won was her F-3 visa fee. Her visa is now tied to mine. We need to extend our stay every year. There is no 90-day check-in with Korean Immigration.
So far, everybody seems to like her and thinks that she's "cute." I was extremely concerned how she'd be accepted, because she's 22 years my junior (and over one foot shorter) in a country where an age difference over five years is extreme. She is also uneducated and speaks no Korean and very little English. (She is helpless alone in an airport outside of Thailand.) So far, this hasn't been a problem. I'm amazed, because she's illiterate here in Korea, but has still been able to go out alone and find her way. The streets where we live have names, but that is very unusual for Korea. (And, she can't read the signs, anyway. We live on "Soi" ["Gil"] 4 ["Sa"], and so far that's been enough.)
It may be premature to call this a success story. Our problem is that it's the slow season, we're in a recession of sorts, and the school is losing money. Her problem will be that the coldest she's ever known is Chiang Mai at Christmas. Usually the snow is only a few inches deep, buy last year it got to be a few feet deep and people were snowed in for a few days. Either way, that girl is going to have ice cream in her bra before June.
Unrelated, but worth mentioning: everybody's favorite teacher (do the initials "P.R." ring any bells?) once told me that he was heading for Korea. (Instead, he turned up at S'flower where he got fired and, just like at BFITS, made up a story about not being paid.) Now that I'm in Korea, I rather enjoy sending him e-mails asking where he's teaching so we can visit. No response so far.