A week ago, Changmin of 2AM posted this picture of him and Hwangbo on his twitter in support of Buin's new song~!
Hwang Buin filming for Midnight Idols from baidu
Hyunjun and Hwangbo tweets:
HB: You can invite me for your radio broadcast since you have no guest this morning. I will come and sing my song
HJB: Nuna please come~ Welcome!