Okay, I will write the first review, because I feel nobody wants to do it. Haha!
This is a mess and most likely a disappointment to many. Nothing was shown or explained clearly. It's only a "spinoff", 10 minutes long, that felt more like some kind of longer music video. I still hope s2 will answer all our questions. That said, this spinoff was beautifully filmed. The backgrounds, the colors, the places, the music were great. The acting was perfect too. Especially when there wasn't much story they had to act out. They just put some scenes together in such a random way that's hard to even form an opinion about the whole thing. Shu Yi's behavior felt out of character, which I'm not a fan of. But we don't know the whole background, so hopefully at the end of s2 all those puzzle pieces will come together and make sense.
EDIT: those puzzle pieces made not much sense. Very lazy writing.