I don't think Miss A or Suzy necessarily have the pure and innocent concept. They have sexy concept since debut. Other girlgroup like girl's day have gained advantage over dating rumours and majority of people take the news positively. SImilar with Yoona-LSG relationship and that couple still have a good image, works and CF. Kim Yuna was also in relationship and her bf was allegedly cheating on her but she still the queen of CF. I don't think it will be like you said. I think She'll be fine.