My Best Friend's Game: Vengeance on the Devil

The blind date was arranged for Eunwoo and her friend Yuri went in her place, and Yuri came away from it dating Jaeseop. When her family's money was gone, Yuri had reason not to be the bride herself, and Jaeseop was in a hurry to be married, so she set up a match between him and Eunwoo. Eunwoo married him with none of this explained to her. On the first anniversary she finds out that Jaeseop and Yuri had never stopped, and that it had been running since before the wedding. In the days after, a stranger she meets by chance is the one person who is decent to her. At a meal with her husband's family she works out who he is: Minhyuk, Jaeseop's half-brother. The friend she trusted, the husband she married, and the man across the table are all connected. Eunwoo stops going along with the arrangement other people made for her and begins to take it apart.