Many k-dramas use child actors for flashbacks that explain what previously happened in characters' lives.

While child stars such as Kim So Hyun and Yeo Jin Goo were already veteran actors by the time they reached the age of 15, some dramas are filmed under schedules that can be punishing even for adult actors.

And in the case of younger singer-actors, many have to combine film and drama work with exhausting touring and recording schedules.
Concern that Korea's young entertainers work too many hours, recently led to the passage of the Culture and Arts Industry Development Law.
To read the article, visit kdramastars.com.