On the December 13 broadcast of MBC's 'Radio Star', Dongjun revealed he's become very close to Song Seung Hun who he worked together with for OCN drama 'Black'. Regarding the actor, Dongjun said, "He loves music. He loves the tones of Bolbbalgan4 and IU." He added, "I'm going to give him a call after this (recording). He gets shy. During an interview, I've mentioned Seung Hun hyung is a big fan of IU, and he told me not to talk about that."

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When asked if he's drinking buddies with So Ji Sub, Dongjun revealed, "The three of us - me, Ji Sub hyung, and Seung Hun hyung - drank 10 bottles of soju together til 5 am. We enjoyed drinking cucumber soju. We drank that til 5 am."

The MCs asked who usually takes care of the bill. Dongjun answered, "Usually, if it's the three of us then Ji Sub hyung pays. Recently, we went golfing and Seung Hun hyung paid then. They don't let me pay for anything so I give them small gifts. He (Song Seung Hun) loves jelly so I give him bear gummies to munch on while traveling."