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In page Kim Jae-kyung:

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She was a trainee at JYP Entertainment before switching to DSP Media.[1] While under DSP Media, in 2007 she was asked if she wanted to debut as a member of Kara. Kim turned the offer down because she thought she would be happy with her Rainbow members.[2] In 2007, she was asked to join SM Entertainment, hinting at the possibility that she may have joined Girls' Generation.[2] In 2008, she appeared in SS501's song "A Song Calling For You" music video before debuting as a Rainbow member.[citation needed]