(More specifically, an in-between belt test. Several of which have to be taken before an actual belt test. And the actual belt test isn't actually recognized by the WTF unless you pay more money for a WTF belt test.)
An American educator moves moved to Korea, presumably to teach English. Instead she discovers discovered that learning Korean one taekwondo class at a time is was a more captivating activity.
Somewhere along the way, she met a Good Man, fell in love, and ended up back in the States. Still doing taekwondo, still learning Korean...