Rainbow is alive and actually made a comeback. The real question is whether or not DSP will actually try to promote Rainbow now that Kara is gone and April is a garbage-tier group so far.
This time, Rainbow goes with the safe, yet strong "Whoo." For some reason, Koreans thought "Black Swan" was terrible. Maybe Kim Jong Un actually has tested a nuclear bomb underground, and some of the nuclear radiation escaped the ground into South Korean air, causing Koreans to have shit taste in music. That makes sense to me, so let's roll with it!
The strong point of this song is that it keeps its fast-paced rhythm throughout the song, except for that three-second bridge near the end of the song. Even during that bridge, the song didn't slow down that much. It doesn't hurt that the song is lead by a guitar instrumental, as that makes the song more listenable for me.
However, the song lacks a strong chorus, which keeps this song from being great. As it is, it's still very good in my books. Will this song help Rainbow out? Who the hell knows at this point. For a group who has released songs such as "A", "Mach", "To Me", "Sweet Dream", and "Black Swan", you would figure Rainbow would be doing very well.
As for the MV, it's hard to actually comment on MVs that just focus on the members dancing. It's hard to say anything except for: they're hot.
Blonde Woori is life, though.