After Rebirth, I Killed the Scumbag's Entire Family

From the back cover

In her first life, Sunny kept the peace when her sister-in-law Felicity lured her into a trap and her husband's friend Zack assaulted her. Her husband Ethan called them family and told her not to blow things out of proportion. Later Ethan divorced her, Zack leaked the video, and her parents shunned her and changed the locks. She jumped from a building, and afterward Ethan remarried on her assets while her parents bought her brother Tyler a house with her insurance money. It was all a setup.

Reborn just before Felicity's call, Sunny agrees to bring wine over. She plays along with Zack and his friends, spikes the wine with sleeping pills, and has the unconscious men carted off to a shady underground club. She returns home composed, dodging Ethan's questions, and heads to her mother's place, where Tyler is beating their mother for cash. Her mother urges Tyler to hit Sunny instead, but Sunny coolly reminds him about his down payment and watches the family turn on itself.

Now she means to settle every score, slowly but surely.