DEAN revealed his thoughts on collaborating with Sulli for his comeback song "Mayfly". 

On November 8, DEAN posted a story to Instagram, stating, "There are a lot of talented female singers in Korea, but I personally thought Sulli's voice and image would be the most fitting for the sad mood of the lyrics and melody of the song. She also fits the picture of the song the most, and my opinion hasn't changed about that! Love and peace," adding a shout-out to Sulli's Instagram. 

Some netizens had a negative reaction to the news that the former f(x) member would be featuring in the song, and it seems DEAN wanted to speak up on his reasons for the decision.

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