Murong Xue XL (I Get Stronger by Doing Nothing)

Murong Xue was an aristocrat who's life got turned upside down when the main character got issekai'd into her world. To please her aunt she (pretty brazenly) tries to kill him or get him arrested but fails repeatedly. The MC seemed to be willing to let these attacks slide until she cooked a poisoned meal for him and his harem where he finally decided to end her life.