Here's the answer:
“당신의 의견은 뭐예요?”
Watch a real native speaker say it:
Here's how it sounds in a textbook:
Fun fact: the hundreds of thousands of people learning Korean with Memrise get this phrase correct 90.34% of the time!
Fun fact: the hundreds of thousands of people learning Korean with Memrise get this phrase correct 90.34% of the time!