A Former Assassin Was Reborn as a Blue-Blooded Daughter.

The story follows Serena, a former assassin who finds herself reborn into a new life as the daughter of a noble duke. Trading her lethal skills for aristocratic etiquette, she must navigate the treacherous waters of high society—a world far more dangerous than any battlefield she's known. As Serena struggles to adapt to her refined new identity, she faces challenges from every direction: a mother whose whimsical nature clashes with her own pragmatic worldview, and an adoptive sister whose sweet facade masks calculating intentions. The glittering tea parties and prestigious academy life prove to be battlegrounds of their own, where words cut deeper than any blade. Haunted by her past and unfamiliar with the language of love and friendship, Serena's journey is one of self-discovery in an alien world of ballrooms and betrayal. Can a woman forged in shadows learn to thrive in the light of aristocratic society? This tale blends comedy and romance as Serena, the assassin-turned-noblewoman, attempts to rewrite her destiny in a world where the most dangerous weapons might just be a smile and a well-placed compliment. (Source: MangaDex)