I'd argue it is your job to teach words such as "jist." Such words are unique and used in speaking, this is something they can't study very easily from a book. I devote entire classes to these kinds of words (slang & idioms) a few times each semester. Certainly don't let anybody on these forums persuade you to teach a certain style.
At any rate, to the topic at hand... I find relationships to be the most important thing in Korea. I think most people would agree. Your teaching ability is actually not that important (this is kind of shocking, no?). My biggest asset is how much my VP likes me. We drink together, he tells everybody that I am his son, etc. These relationships are important, and they can be good fun. Co-teacher relationships are also important, but obviously less so than your principal and CT. Lastly, keep on good terms with your students.
I know you're in a tough position, but in the future try to integrate into the "system" more. Occasionally I wont go to dinners, but I try to make it most times. I didn't go on the teacher trip we just had, but I know they wont hold it against me. But if you have no relationship, or a rocky relationship, you should go. Once you establish the relationships (particularly with the elder faculty), you're pretty much golden and you have a bit more wiggle room.
My school gave me rave reviews and I felt I had a rather mediocre year. I'm usually not satisfied with my lessons and I hope to improve on them each year.
Contact your district coordinator and tell them your situation (casting yourself only in a positive light). Maybe you can get a transfer. See if your school will give you a recommendation.
Sorry if my post was long and boring. I know I don't share your experience, but I thought you wouldn't mind reading about my experiences and opinions on whether or not schools like you.