The story is about Serena, a former assassin who was reincarnated as a duke's daughter after failing her mission. She initially thought that pretending to be a noble would be easy, but she struggled with the gap in perception between herself and her mother, who had a flighty personality, and her adoptive sister, who deceived those around her in an attempt to push Serena out of the picture.
 
Despite skillfully dodging the harassment she faced at the tea parties full of rivalry and navigating the complex social life of a school embroiled in love and hate, Serena's cold demeanor resulted in her being ostracized and isolated. One day, she discovers that her adoptive sister is engaged to the second prince, which leads her to run away from home. However, it is at this point that the first prince, Evan, appears in front of her...
 
Follow Serena, a former assassin who knows nothing of love, as she charges forward into the aristocratic society of another world in this comedic, occasionally romantic tale.

Enter Lady Selena, the former assassin who assumed it'd be easy to step into the role of pampered mademoiselle, but who finds herself aggravated by how differently she views things compared to her flower-brained mother and her scheming, deceitful (yet utterly ineffective) stepsister. She navigates tea parties filled with ladies attempting to assert their dominance, attends an academy thick with ulterior motives, and dodges harassment flung at her with an icy glare and fierce counters, but it's that stone-cold heart of hers that leaves her isolated and alone.
 
One day, she learns her stepsister has become engaged to the second prince, a fact that forces her to run away from home. She doesn't get far before bumping into someone, however, and that someone just happens to be the first prince. Come watch as the cold-blooded former assassin who's never known love dives fearlessly into noble society!
 
(Source: Cross Infinite World)

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