Blood Free follows the story of Yoon Ja-yu, the CEO of BF Group, a biotechnology company that has revolutionized the food industry by introducing lab-grown cultured meat. While her company dominates the market and disrupts traditional livestock farming, she faces intense scrutiny and threats from various factions, including those who believe her technology is unnatural and those who want to seize control of her patents. To protect herself, Ja-yu hires Woo Chae-woon, a former soldier with a mysterious past and a hidden agenda. As they navigate a world of corporate espionage, political corruption, and ethical dilemmas, they must uncover the truth behind a series of violent incidents and the shadowy figures attempting to dismantle BF Group from within.