I think this style of song is more suited towards March/April or October/November. But they've always released summer-vibe songs for the past few years so at least they're changing something up. The song itself, I think Hyorin has a bit too much lines. Soyou could've had a few more tbh.
I actually prefer this. I'm not a big fan of their past summer themed songs tbh XD. Glad they went back to this :3