My Childhood Friend Became an Obsessive Husband

The protagonist, Isabelle, is an orphan living in a temple who has gained knowledge about love from reading forbidden novels. She finds out that she has been sold to a Duke known for killing his lovers due to his inability to perform. In order to escape this fate, she decides to marry her childhood friend, Riggs, who is also a noble and agrees to her request. However, Isabelle is surprised to find that Riggs has a secret identity and that their relationship changes after they get married. It could be an interesting story about a young woman who is trying to escape a dangerous situation and the lengths she will go to do so, and the shifting dynamics of relationships and the secrets that can be hidden behind them. Depending on how you choose to develop this story, it could explore themes of power, trust and self-preservation.