Accuracy. The voices need to accurately represent the time period and the people in the true story. For example, if it's set in an old - fashioned village, the accents and dialects used should be appropriate.
One example is 'Reply 1988'. It is based on the real - life experiences and culture of the 1980s in South Korea. The story focuses on the lives of families and friends in a neighborhood, showing their daily interactions, joys, and sorrows. The voice acting in this kdrama also adds to the authenticity and charm of the story.