Samyang made a mistake on the poster with the girls' signatures, Seohyun's signature is missing. But Krystal's signature is there, its the second one from the left D: in case anyone is curious the order of the signatures are as follows: Taeyeon - Krystal - Yoona - Hyoyeon - Sunny - Tiffany - Jessica - Sooyoung - Yuri
If you're mega hxc, you can download the full-sized posters from the Samyang site. The original files range from 5MB to 17MB each lol.
source: Samyang + bossa747's twitter