Ibwayo, Agi Gongjangnim Nunaman Mideo!

After a tragic life spent in the shadow of her superior Duke Senoc Blacknight, the powerful Dame Aspyn Soir is sent back in time and given a lucky second chance at life. She's thrilled, at least until she runs into the very same Senoc! However, this frightened boy is very different from the cool, composed sword master Aspyn knew. Even though Senoc nearly killed her, she can't help taking pity on his younger self. If nobody stops her, Aspyn just might end up helping out her greatest enemy.
(Source: Tapas)