High temperature doomsday, I took revenge on the biased family

The premise

In a previous life, your dedication as a valedictorian meant nothing to a family that viewed you as a mere resource for their favored son. Now, faced with a lethal heatwave doomsday scenario, you are reborn with the chance to correct those historical errors. No longer will you tolerate being beaten or sold into unwanted marriages. Embrace your new timeline where you withhold support, expose the hypocrisy of your parents, and dismantle the golden child's status. This fantasy-driven narrative blends survival horror elements with cathartic revenge, offering a story where the protagonist actively rejects traditional duty in favor of self-preservation and justice.