Which of the big three trained actor Kwak Si Yang?

In the upcoming episode of MBC's 'Radio Star,' the talented actor and beloved 'We Got Married' hubby, Kwak Si Yang, made an appearance and revealed during the recording that he had originally been a trainee at SM Entertainment!  

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He then showed off his moves by performing to H.O.T's "We Are the Future."  On top of that, he had a staring contest with Kyuhyun.  You can see all of that when the episode airs tomorrow!