Singer Kim Bum Soo confessed that he was upset after working with J.Y. Park back in 2010.

On the December 6 episode of the popular MBC talk show 'Radio Star,' J.Y. Park, Kim Bum Soo, Kim Wan Sun, and Park Mi Kyung appeared as special guests to talk about various topics.

During the episode, the MCs brought up the topic of his past work with J.Y. Park and asked Kim Bum Soo, "You said you became upset when working with J.Y. Park before, right?" Kim Bum Soo began by saying, "Of course, it was a great honor to work with J.Y. Park back then. But it was my song so I expected be the main protagonist in the music video but I only appeared in it for 12 seconds, and the rest was J.Y. Park hyung."

The MCs were confused and asked, "So J.Y. Park wasn't featured in your song or anything? But he just appeared in the song?" Kim Bum Soo clarified, "It was a concept where J.Y. Park was directing."

Curious about the music video, the MCs revealed the music video in question for Kim Bum Soo's "Passing/It Will Pass" and began commenting on it.

While watching the video, they commented, "Why is he so serious?" "He's even lip-syncing," "Why are you praying?" and "(Kim Bum Soo) really went by passing," bringing laughter to the studio. 

MC Yoo Se Yoon pointed out, "The camera didn't even go inside the recording booth (where Kim Bum Soo was)."  MC Jang Do Yeon joked, "So the song is titled 'Passing,' that's the point of the music video (that Kim Bum Soo appears in 'Passing.')."

J.Y. Park defended himself by saying, "I'm saying this now, but even then, Bum Soo's label wasn't so confident with Bum Soo's (visuals). This wasn't done because I wanted it." He continued to half-jokingly say, "I didn't want to hurt his feelings, but it was his label's intention. I didn't want to appear in his music video..."

Kim Bum Soo joked back, "I wasn't really mad about it... but I'm angry now," making everyone laugh.