On the June 15 broadcast of 'MV Bank Stardust 2', MC D.O. interviewed his members. During the talk, D.O. startled Kai as he asked, "So how have you been...Kai?" The members then laughed, while Kai answered, "We have prepared double title songs "Lucky One", and "Monster", so I have worked hard for our comeback." 

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D.O. continued to poke fun at Kai as he said, "Can you show us what you practiced?" Then Suho chimed in, "Can you just follow the script?"

Later on, Kai also stated, "I personally want to sing a duet with D.O. hyung. I love his voice.", but then D.O. jokingly responded, "I don't. EXO's promotions are good enough for me."