I imagine shit went down like this:
Jiyeon, Qri, Boram: "So, do we get any lines in this song?"
Manager: "Nope, we'll see you three tomorrow at the CF shooting."
J, Q, B: "You fuckers can fit in a shitty rap from Hwayoung but you can't give each of us a line?"
Manager: "Sorry. It's just how shit rolls."
J, Q, B: "Can't you just give us some of Soyeon's lines? She basically sings the whole song."
Hyomin and Eunjung: "No, you can't. If they take away any of Soyeon's lines, then the damn producer will take away our lines and give them to Soyeon."
Manager: "Guys, just roll with it. It'll be the same thing once you start having original Japanese songs."
J,Q,B,H,E: "What, we can't be like SNSD and translate 10 songs?"
Manager: "No, you guys have to remember that EMI will be running your Japanese promotions, not Kim Kwang Soo."
Yeah, I liked the song more than I thought I would. Though Hwayoung's raps have no place in the song.