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Reportedly, right after DIA's appearance on JTBC's 'A Hyung I Know' on which Heechul is a fixed member, the Super Junior member personally called Jung Chae Yeon's label to cast her for M&D (Kim Hee Chul & Kim Jung Mo)'s 2nd mini album MV. 

Heechul is known for carrying out all aspects including directing, scenarios, casting, and more for M&D's projects. On why he cast Jung Chae Yeon, he revealed, "Her charm is that she has a pure image with clear, white skin, but is also quirky and spontaneous." 

Sounds like M&D are gearing up for a comeback!