Check out Word Circle (동그라미) - a Korean vocabulary game. It's available on Android and iOS.

Android update including pronunciations, search in English and verb definitions

Pronunciations added to! Click next to a conjugation to hear it pronounced. Find out how to pronounce Choi or Lee in Korean.

It is error-prone to convert from Romanized Korean back to Korean so that feature is not supported. Try finding the Korean text and paste it in to get the pronunciation.