Thunder guested on SBS powerFM's 'Kim Chang Ryul's Old School' on December 15!

He had joined agency Mystic89 after leaving MBLAQ, so he was asked whether he had any celebrity friends in the company yet.  He revealed, "I recently got a bit closer to Eddy Kim because we're the same age.  We got closer while also playing games."

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When asked about music-related activities together, Thunder said, "We did say we should write a song together some day.  But in the end, all we do together is play games," and laughed.