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https://twitter.com/JusticeForEren/status/1480714061620944902So this song is quite literally talking about what Eren has done to the earth. The price for him cleaning the earth, was her own life. So she asks him before she dies, "If you could just smile for me, that's all I want."
To start off, lets discuss what Yuko Ando spoke about when she made the album version for Shock, as well as its bside "Goodbye Halo". She says here Shock and Goodbye Halo are connected but made with two different sounds to "create a different world".

If you want to check for yourself, here's the link: shingeki.net/#/story
https://twitter.com/JusticeForEren/status/1480694813519486977

https://twitter.com/JusticeForEren/status/1448444728165404673?s=20
https://twitter.com/JusticeForEren/status/1480714061620944902This clip says this: