Kim Ji Soo from Mnet's "Superstar K2" and SS501 Kim Hyung Joon will be singing a duet for an OST titled "Love is" for the upcoming musical "Caffeine". This will be Kim Ji Soo's debut in a song and the song will be released on the 26th of November.

The song will be a nice ballad where the vocals of Kim Hyung Joon and Kim Ji Soo are perfect for the song. However, there is still no decision whether they will be promoting the song or not.

Meanwhile, behind the scenes photo's were revealed while the two were recording the song.

Source: Nate + Osen
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