(Version 2)

Isabella is a kind young lady who lives in a small village with her little sister named Sophia. Isabella is an author that sells her books at her local bookstore with the help of her uncle. Sophia works as an inventor but is never taken seriously. One day she gets captured while delivering a package. To save her, Isabella trades herself to the mafia king that has been cursed with a murderous beast that could be the end of the universe.

(Version 1 is more descriptive and has a different storyline, you can head to my proflie and try that out too :) )