K-Drama staffs reveal why producers prefer to cast idols over rookie actors

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I feel really bad for these rookie actors who spend years trying to learn the craft only to be sidelined by idols...it's the same when you have famous actors voicing animation, voice actors spend years trying to develop a range of voices only to be sidelined by say Chris Rock and paid millions.

The main reason is recognition even if they don't want to admit it, it gets them publicity for their show.