My Reborn MIL in the 70s

Cassia Jennings transmigrated into a novel, becoming the vicious female antagonist. She married Joel Shaw, the male lead's brother. She despised Joel, leading to divorce. Later, she ended up disfigured, freezing to death, while Joel became a business tycoon. Cassia decides to change her fate. She changes her ways, treating Joel and mother-in-law sincerely, receiving unexpected warmth.