Manhwa where in the beginning, the female lead is destined to marry the future emperor. When their coronation comes, she’s extremely frail and dies; she’s replaced by another woman and her husband does nothing to save her. Turns out she’s been poisoned and dies after being abandoned, before waking up and finding out she travelled back in time.
The protagonist has blonde hair and blonde eyelashes.
It's not A Marriage Alliance for Revenge. The female lead doesn't have white hair. I don't remember the hair color of the male lead. She's betrayed by what I think was her cousin, who has short brown hair and purple eyes.