Yesterday, 2PM's Junsu unveiled his debut track as a composer for Part 6 of KBS2TV's "Dream High" OST. Titled "Don't Go", the song was a collaborative effort between 'Jun.K' (Junsu's composer name), One Way's Chance, J-Lim, and guitarist Sam Lee. Recently, footage from the recording studio was released through 'Real2PM'. In the video, Junsu is shown in a more serious light, which differs from what most fans are used to seeing. He's found giving vocal directions to his music industry senior, J-Lim, as he perfects the recording of his song. During the recording, Junsu expressed that he was very glad to be able to work with J-Lim, and that he felt very nervous. He also mentioned that the she helped him a lot during his trainee days. Chance commented that this was a collaboration of the greatest male and female vocalists. Check out the video below! http://www.youtube.com/watch?v=AZwMXoPSiqE