I Will Divorce the Female Lead’s Siscon BrotherI Will Divorce the Female Lead's Siscon Brother; 여주의 시스콤 오빠와 이혼하겠습니다; Yeojuui Siseukom Oppawa Ihonhagetseumnida; I Will Divorce the Female Lead's Older Brother; Me divorciaré del hermano Siscon de la protagonista femenina; シスコン夫と離婚します！; 我要和女主的妹控哥哥离婚

Ethel, who reincarnated into her favorite novel, has married the female leads brother Liena. She thought her marriage life was genuine, but soon enough she became tired of a husband who cared only for his sister and whose attention was always centered on Liena, yet was cold to her, so she filed for divorce. Divorce? Absolutely not! However, her opponent is a powerful duke, so she turns to Terrence, the villain of the original story to be her assistant for a smooth divorce. The only person I want to have by my side is you, Ethel. But this mans fate is to be hurt by Liena. As the more she knew about Terrence, the more he seemed attractive to her?