Kiana, the troublemaker of the Prelai duchy. She was about to give up her life as a villainess and be reborn as a new person. Until one day, the family was hanged for treason. 'There's no need to kill me, who ran away from home 7 years ago and was only doing research in the countryside!' The moment I realized that the academy, who said that I was a genius and would live like a family, betrayed me, and that treason was also framed by someone. Due to a mysterious power, I returned to a year ago! "I can't help it. Now that it's like this, I, who is smart and strong, has no choice but to save the ducal family." There are two things to do for the family. “Will I be of help to you someday too?” “I tried to save him because he was precious to my grandfather.” Restoring the relationship with the family, which was a mess, and “Please pretend to be in a relationship with me externally.” Holding hands with 'that man'. Oh, before that. I said, pouring a water bottle over the dean's head during the lecture. “This is gravity.” Get revenge on those academy guys who have no morals. Kiana, who returned smarter and more vicious, <Strange but Effective Life as a Villain>