Mega-rich CEO Jiang Huai is sentenced to life for his mother's murder—a frame job orchestrated by his wife and best friend to seize his empire. Trapped in a brutal Devil Prison, he vows to escape within seven days after his sister, Yao Yao, is forced into a deadly marriage. A deadly game of cat and mouse ensues as Jiang Huai fights through extreme security to repay blood with blood.