The unprecedented super typhoon Hinnamnor strikes Pohang, directly hitting the POSCO steelworks, the heart of the nation's heavy industry. In a desperate situation, the heart of the steelworks, which has been burning hot without stopping for nearly 50 years, faces the crisis of stopping. Amidst this, investigative journalism PD Oh Yoon-hwa infiltrates the steelworks to uncover the truth of the disaster... The deadline to revive the 'blast furnace,' the heart of the steelworks, is just one week. Can they save the blast furnace?