Weird that they didn't have a simultaneous launch on iTunes. That sucks.
Hasn't been a bad song yet. Really cohesive and consistent sound. Every track is very 80s, One Black Night has a kind of darker synth feel to it. God this is so good. Yeeun's really killing these choruses, makes it easier to deal with no Sunye.
Edit: BACK is one that'll have to grow on me, it's always like that for me with their rap centric tracks. I do like the beat. OPPA is similar in that it's really focused on Lim's rap vocals, less so than BACK but still more than usual. 사랑이 떠나려 할 때 brought me right back into it though, fucking love this kind of slower tempo synth pop ballad.
Edit 2: Okay, the first 2/3 of the album definitely feels stronger than the the last third, it slows down pretty significantly towards the end. Not necessarily in a bad way, there's some great stuff going on still. Really like the instrumental in GONE.