Kim Yoo Jung will no longer be seen in "Secret Door." Yoon So Hee will replace her, but the drama's producers want to explain that her replacement is not the result of a casting problem.

The producers explained that it was never previously determined how many episodes the young actress would star in. The actress who has played the younger versions of leading actresses in many dramas, including "Moon Embracing The Sun," "Golden Rainbow" and "May Queen," is slowly making the transition to adult roles. When she was cast in "Secret Door" it seemed as if it might be a role that the 15-year-old actress would act throughout.

According to the producers, as the storyline of  "Secret Door" progressed, it became too hard to bridge the gap in ages between Lee Je Hoon's real age and hers.
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