Read The Return of Elena the Knight manhwa
Elena died in vain without successfully claiming her revenge even after spending her whole life in the identity of a cold-hearted knight. The moment Elena opened her eyes again, she found out that she was back to her past. In daytime, she was like any other lady in dress but when the night came, she became a knight with a sword to change the course of history and save her family from the destruction that was waiting ahead of them.
“I want to marry you, Your Highness”
She would do everything to save her family, even if it meant marrying the crown prince.
Return of the Female Knight