Yebin and Somyi's duet is called "Seoraksan in October", a song illustrating the beauty of Seoraksan in the fall when the trees turn different colors, and expressing one's wishes to take off on an adventure come the fall season. 

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The girls will be taking a break from DIA as they participate in 'The Unit' to show their charms off to the public.

Check out the song and MV above!