M.Pire's Lumin appeared on the October 1st edition of MBC's 'Radio Star' with his father, legendary singer Sul Woon Do, for the father-son special and revealed that MC Kyuhyun made them drink alcohol in the past. 

When asked if he was acquainted with MC Kyuhyun, Lumin answered that they had drank a couple times before. Kim Gu Ra replied he heard that Kyuhyun made his junior singers drink a lot. Lumin recalled one time when Kyuhyun made him drink 2 mugs full of alcohol. Lumin said, "The last time I saw Kyuhyun, he was drinking alcohol in a mug," hinting at Kyuhyun's high tolerance to alcohol.

He then added, "Kangin would call Kyuhyun every time we drank and that was when Kyuhyun had just joined Super Junior." Lumin disclosed that when Kyuhyun arrived, he would do to the juniors exactly what Kangin had done to him in the past, which was to make them drink alcohol out of a mug.

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Lumin said, "I one-shotted 2 mugs full of alcohol and said, 'I'm okay,' but that was the last thing I remember." 

Sul Woon Do asked, "Do you drink every time your senior offers?" Feeling uneasy about Sul Woon Do's reaction, Kyuhyun apologetically said, "The one who made your son black out was me."

Sul Woon Do then firmly replied, "Be careful," making everyone laugh.