C57
Ge Yan and Rex didn't know that they were being targeted. Yes, it was them. Although Ge Yan didn't participate, Arva helped him register for Rex, so he was also included in the plan.
Not only could the registration for the Dragonrider selection be anonymous, they could also ask for help.
That day, after Arva got the nod from Sydney, she arranged for people to look for Advanced Swordsman