Secret Garden is in danger to replace it’s already confirmed female lead, Ha Ji Won.
This happens because of schedule problem.
Secret Garden is scheduled to air at the end of September replacing family drama Life is Beautiful.
But, right now, Ha Ji Won is busy  filming her sci-fi movie “Section 7” and the filming is projected to finish at the end of September too.
So, it is impossible for Secret Garden to start broadcast the drama at the end of September.

After discussion between the production teams,  the possibility is to extend Life is Beautiful runs. Life is Beautiful is planned for 50 episodes and  Kim Soo Hyun, Life is Beautiful’ scriptwriter, was asked to create 10 to 15 episode more. It means additional 5 to 7 weeks for  Secret Garden production team.

So, right now , Kim Soo Hyun, the scriptwriter,  has the key for Secret Garden !

Source : dongA