It's the December of 2013, and you're Taeyeon of SNSD SM's two rookie groups, Exo (Xiumin, Suho, Lay, Baekhyun, Chen, Chanyeol, D.O., Kai, Sehun, Kris, Luhan, and Tao) and SNSD (Taeyeon, Jessica, Sunny, Tiffany, Hyoyeon, Yuri, Sooyoung, Yoona, and Seohyun) are all on holiday break Most members of both groups are teenagers, so they spend their holidays in the company building It's Christmas Eve, and you're with your members in your dorm when someone knocks Sunny: I wonder who is here.