obviously JB is singing like that purposely... for effect. You're all some haters. I've seen worse things get praised in here. All these girl group stans too
If the effect he's going for is to make everyone simultaneously scream "no no no no nO NO NO" and close the MV mid-song then he's ****ing succeeded.
I went to listen again: The vocal styling isn't out of the ordinary for this kind of R&B-influenced track: incidentally hideous-sounding, but like I said earlier, DEAN sounds the same way on all his songs.
Why they married it to the what is basically Teen Top's Ah Ah 2016 Version, I don't know. I just think it's boring, but not really bad.