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I would try to avoid Kim if there are other options for math. His accent is hard to follow and he spends more time in class doing proofs and theorems then on explaining the material. I watched Kahn academy videos every night before lecture so that I would be able to follow him in class. He also teaches in a confusing manner so watching Kahn academy videos helped simplified what he was trying to say.

He's an alright professor. He spent most of the class just explaining proofs of theorems and formulas, which is fine, but sometimes there were a little confusing and hard to follow and you don't really need them for the test.
If you do the homework questions, go to office hours for help, and finish all of his practice exams, you should do well. This exams are extremely straightforward and as long as you know the method to solving the problems, the exams will be very doable.
His office hours are extremely helpful because he'll teach you how to do the problem and give you the correct answer, which is nice because your homework grade depends on the accuracy of two random problems.

Taken during Fall 2014

Kim is an effective professor and explains concepts clearly. If you do not understand anything, he is open to answering questions on the spot during lecture. Else, his office hours are also useful. One downside is that he has an accent, but it is not hard to understand, and I got used to it after 1 or 2 lectures.

The pace of the class is good, as he omitted sections when he realized that he cannot cover them in time, instead of trying to rush through them.

I like the grading and structure of the class. You can drop the lower of your 2 midterms, provided your final is better. The 2 grading schemes are as follow: Final is 45%, midterms are 20% each or final is 55%, higher of midterms 30%. Homework is 15%.

There are 10 homework questions each week, with one week to work on them. 8 problems are from the textbook, and the remaining 2 are his own problems.
3 problems are marked, on a 10 points scale. I spent quite a bit of time on them each week (probably two to three hours), but they are doable.

He also sends practice problems and midterms, which means you don't have to go the test bank at all. Also, you should probably study these practice problems as he tends to put one or two similar questions on the midterm or final.

The class is curved at the end.

In other words, Kim is awesome, and 31B is pretty alright with him.