I'm not sure which novel you're referring to, but usually, the plot of the female protagonist giving 600,000 dollars to a woman named Rose Su might be like this: The heroine of this novel could be a wealthy woman who received $600,000 in an accident and decided to give the money to someone she trusted, such as her friend, relative, or business partner. The 600,000 dollars might have been accumulated through years of hard work or through some means. She decided to hand it over to someone she trusted to manage it so that she could enjoy the benefits of the money with peace of mind. However, the specific plot and details still need to be confirmed according to the novel you described.