Hyuk shared an Instagram post which read, "Our 'Mother's friend's son' (a Korean slang term referring to males with a friendly image) Dong Hyun, who used to come cheer me on at my movie filming set with drinks, has debuted~ Be healthy in your promotions, you body, and your heart, and let's become respectable singers together, even though this hyung also lacks. Fighting!!" 

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In Hyuk's posts, the idol sunbae proudly holds up a signed copy of MXM's 'Unmix' from his hoobae, in addition to a closer shot of the album. Kim Dong Hyun also shared the same snapshot on Brand New Boys's official Instagram, revealing that the two are from the same home town!

What a good sunbae-hoobae relationship!

영화찍을때 응원오겠다며 귀엽게음료수사들고오던 우리의 엄친아 동현이가 데뷔를했구나~ 앞으로 활동도 몸도마음도 건강하게 잘하고 형도많이부족하지만 멋진가수가 되자. 화이팅!! #mxm #imtheone #김동현 #진짜엄마친구아들 #대전인 #유리쌤의꿀래미들그램

A post shared by 한상혁 (@hsh0705) on Sep 15, 2017 at 4:53am PDT

[#MXM/김동현] 오늘 저랑 같은 고향인 #빅스 #혁 선배님을 뵙게되었어요! 선배님 저희 MXM 많이 예뻐해주세요!! #브랜뉴뮤직 #브랜뉴보이즈 #임영민 #김동현 #IMTHEONE

A post shared by 브랜뉴보이즈 공식 인스타그램 (@bnmboysofficial) on Sep 15, 2017 at 4:22am PDT