Kim Gu Ra's son, aka MC GREE, was the guest on the June 15 episode of 'Radio Star,' where he humbly bragged about his recent single "19" topping charts. 

The young rapper related, "'19' dominated the charts. I didn't expect it. It placed first at 3 in the morning. It went up to fifth place, then second place, and then all the way up to first place. I 'kicked the roof' [of the charts] three times." 

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Kyuhyun commented, "It was a battle between Parc Jae Jung and Kyuhyun [and MC GREE]," referring to "Two Men," his collab track with Parc Jae Jung which came out around the same time "19" was released. Yoon Jong Shin added, "But the ranking of ['Two Men'] kept dropping at lightning speed. I got a message from Kyuhyun the next day. He wrote, 'I'm sorry.'" 

Despite placing first on the charts, MC GREE didn't let all the success get to his head and went on to compose another song at the studio...or so he claimed. Perhaps we should be looking forward to another hit song from MC GREE some time soon? 

Check out MC GREE performing "19" on 'Radio Star' below.