So the name of this story will be Immortal Game. The stars will be members of B2st and F(x) plus Ailee. Thanks to -Tigress-'s suggestion that it's like casting them in movies that helped me. <3 It's for -Tigress-'s plot prompt contest. Plot chosen...

PROMPT 15: An idol and a fan switch bodies – they then have to live in each other’s shoes as best as they can until they can find a way to fix it.