My Husband's Mistress Was My Ex-Girlfriend

夫の浮気相手は私の元カノでした

The story follows the complicated lives of Sami, her husband, and his mistress, Rika—who happens to be Sami's high-school love. As the series unfolds, Rika returns to seek revenge for an alleged betrayal by Sami years prior. However, a major twist in the plot reveals that Sami's actions in the past were actually meant to protect Rika, adding deep emotional tension and reconnecting their old feelings.