On the August 31 broadcast of 'Radio Star', Simon D gave Kim Gook Jin some advice and also commented on Zico's public relationship.

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When asked to share advice with Kim Gook Jin, who recently announced his relationship with Kang Soo Ji, Simon D carefully held Kim Gook Jin's hand, and sincerely said, "Seriously, date as if it is your last time." 

Kyuhyun then asked, "Do you have anything to say to Zico?", referencing the rapper's public relationship with Seolhyun. Simon D simply answered, "I'm jealous."