Composer and CEO Park Jin Young made a guest appearance at MBC's World Changing Quiz. Well, his voice did, at least. During the speed quiz section of the show, 2AM's Jinwoon called his fellow boss to answer some questions. Park Jin Young is currently residing in Manhattan promoting the Wonder Girls. Jinwoon and Park Jin Young  showed off their tight connection as they correctly answered 6 questions in a short amount of time. Interestingly enough, Park Jin Young's ring tone was 2PM's Heartbeat. As an excuse, the producer quickly said, "I couldn't update my phone yet. I will hurry and change the ring tone to 2AM's new song." Park Jin Young also congratulated Jinwoon on graduating high school and expressed, "It's nice that you've become an adult so you can join us in our company dinners now. The new song is in first place too, so I sincerely congratulate you guys." Park Jin Young was not able to put any of his composed songs into 2AM's new album. He expressed his disappointments, "I wrote three songs but they were all pushed back for 'Won't let you go even if I die!' I am a little disappointed over that."