i saw this in wiki
http://en.wikipedia.org/wiki/Rola_Chen"Rosa Killer"
Due to her facial resemblance to Rosa Kato, she has been described as the Better-shaped Rosa (スタイル改良版ローサ, by London Boots Ichi-gō Ni-gō), the Decent-metabolized Rosa (まともに代謝できるローサ) or simply the Rosa Kai (ローサ改). Besides, Chen is often called the Rosa Killer, as she has "taken" Kato's jobs which included many television programs and ads as well as the Asahi coffee product ad and she eventually made Kato a serious "fade out" as the result of it.[3] She has stated that she doesn't like the nickname Rosa Killer because she has nothing against Kato and she didn't know who Kato is until she got the nickname.
are there any sources verifying this? because i love ROSA!! @@