Keep Your Distance, Coldhearted Young Master Gong

At some point, her father seemed to become a different person. He drove her mother to her death, married his mistress, and brought home a younger sister as well.

Standing at the engagement party of her own fiancé and her sister, she knew she had nothing left to do with this family...

Then, in the depths of her misery, she met the man who would save her, and all her misfortunes began to turn around!