>>424584
I meant a purple edition and a white edition so 4 versions in total.
There's so much to theorize from the teaser and it probably isn't even the concept of the title track.
https://www.youtube.com/watch?v=5CP9YQMhqT8
So Sandman is a mythical figure that sprinkles magic sand onto children's eyelids to bring them to dreamland, which I'm pretty sure is the inspiration for this trailer. Firstly I think the trailer is not in chronological order. All of the sleeping girls have glitter and decorations around their eyes. The pillowfight I have no idea but first there's the fight and a clock and then at the end the clock goes backwards and all the girls that were fighting with pillows stare at the camera while time moves backwards. Looks like Chaeyeon and Yena are picking girls to be ascended in their sleep. We see Minju and Eunbi wake up but we only see Eunbi get up and a shot of her alone among 11 empty boats. The sleeping girls have blue dream diaries but there's a golden diary in Chaeyeon and Yena's vault. We don't see a diary with Eunbi but there's a locket or something in her boat. It's Wonyoung's hands that tear out pages from the dream diary but all the pages are blank. Chaeyeon has that creepy smile so I think she's stuck as a dream chronicler and Yena is the one that's awoken, there's a blank silhouette of a duck on the long paper Chaeyeon is writing so that could mean her dreams are missing from the sheet since she's awake.
I think they prioritized visuals over internal consistency so I think a lot of this is useless information, my theory right now is...
TL;DR
Chaeyeon is a dream chronicler, Yena is searching for the girls or girls with the same dream and either awakening them or bringing them to IZLAND where they have a fun pillow fight. Maybe the pillow fight girls have already been awoken and they're then staring at the newly arrived girls but then I don't know what the time reverse means. Fuck me, I'm just going to wait for someone else to think for me.