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Previously, it was revealed that Super Junior's Heechul and Buzz's Min Kyung Hoon, current co-stars on 'A Hyung I Know', decided to sing a duet together to show off their great chemistry, both on and off the screen. The song will babe titled "Butterfly Sleep", a minor rock ballad comparing the feelings of Heechul and Min Kyung Hoon's hopes to remain good friends with the rest of the ' A Hyung I Know' members to that of a man wanted to cherish his memories with his lover for a long time. 

"Butterfly Sleep" will be a little different in that instead of being released on 'SM Station's normal Friday, this time, the song will be revealed on November 19, the same day that 'A Hyung I Know broadcasts! 

What can you gather from their teaser image below?