On the recent broadcast of KBS 2TV's "National Heroes," entertainer Kim Gu Ra put his singing abilities to the test by performing on a hilarious version of 'Nagging' with IU. IU was invited as a guest on this week's episode, where the show ran a special segment called, "IU's Scrapbook," a parody of "Yoo Hee Yeol's Sketchbook." After showcasing a perfect collaboration of 'Nagging' with 2AM's Changmin, she performed the track again, but this time with Kim Gu Ra. Before the song even went on cue, the other guests started to snicker as they suddenly changed the track's title to "Nagging Gu Ra." Without further ado, check out IU and Kim Gu Ra's priceless duet below! And IU and Changmin's duet: Netizens, who have tuned in to this episode, have commented, "Kim Gu Ra's rediscovery", "How cute", "She looks like she could be his daughter ke ke," etc. Source: Nate