Atalante is the boss of a notorious organization that works in the empire’s shadow. One day, she receives a request from the emperor to assassinate a new target: the tyrant archduke Lionel Vianc. Reluctantly leaving behind her simple life with her members, Atalante heads off to perform the assassination, but for some reason… the archduke doesn’t die. After a mixup between a love potion and poison, Atalante finds herself in a frustrating predicament as the tyrant archduke not only refuses to die… but has also fallen in love with her! (Source: WEBTOON)

From: [Psycho Student Council](https://www.mangaupdates.com/groups.html?id=14372) After getting in an unfortunate accident, the twins transmigrated to another world together. The elder sister possessed the body of Princess Liliana, and the younger brother went into the body of Arvid, the 2nd Prince of the Revoluta Empire. But the two were engaged and their wedding is only two months away. How will the two stop this marriage?! [Original Webtoon](https://comic.naver.com/bestChallenge/list?titleId=784497)