Epimetheus ignored his brother Prometheus's warning before accepting Pandora in the myth of Pandora's Box.
Prometheus and Epimetheus are Titan brothers in Greek mythology. Their names are often interpreted in relation to foresight and afterthought: Prometheus is associated with thinking ahead, while Epimetheus is associated with understanding only afterward. That contrast drives the story's central decision.
Prometheus has already angered Zeus by giving fire to humanity. Knowing that Zeus may retaliate, he tells Epimetheus not to accept gifts from the god. Epimetheus nevertheless accepts Pandora, who has been created and sent by Zeus. Pandora later opens the sealed jar, releasing suffering into the world.
The episode is not simply a story about curiosity. It also reflects the mythic conflict between Zeus and Prometheus and presents Epimetheus as a figure whose poor judgment has consequences. Different translations and retellings vary in details, but Prometheus is consistently the brother associated with the warning. The myth's family relationships are therefore important to identifying the answer.