He's from a K-band that called as N.Flying and they are one of my favourite band after Day6 and The Rose. Yes,, they have a good vocalist but sadly they're underrated.. They deserve more attention.. Thank you Sir Nephi for react to this😊
to answer your question, the dude beside him(the one in darker jacket) is his band's drummer, and the other one in lighter jacket is the show's host (since both of them were next to him and both clapped at the end of the perf...i just assumed you're talking bout the drummer because he always has the most eyecatching expressions n easily noticeable. anyway, the one he duets with is the vocalist of a more senior band from the same agency. also known for powerful vocals.
Actually you have reacted to their MV (Still Love You - Lee Hongki & Yoo Hwe Seung) back then. And btw, Yoo Hwe Seung was a member of N.Flying, one of FNC entertainment boy band besides FTisland & CNBLUE.
Hong ki is a king of vocals. React to this song of his with an amazing contestant where Hong Ki was a judge and sang with her... ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-gAzd2n1S4aI.html
You have reacted to the duet 3 years ago. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-WQmDqwtyG40.html This is just a clip from a show when the band, N.Flying, appeared as guest.