Set in the Dan-gun era, 'Lovers of the Red Sky' follows the extraordinary life of Hong Chun-gi, a brilliant female painter who enters the prestigious Dohwaseo (Royal Academy of Painting) with a rare divine talent. Blinded by a tragic childhood incident tied to a supernatural sealing ritual involving the demon of the underworld, her fate becomes inextricably linked with Ha Ram, an officer at the Seowoongwan who lost his sight on the same day but can still read the stars. As dark political forces, royal ambition, and the ancient wrath of the demon threaten the peace of the Joseon dynasty, Chun-gi and Ha Ram must navigate a perilous web of destiny and danger. Their blossoming romance serves as a beacon of light against the encroaching darkness, forcing them to make ultimate sacrifices to keep the malevolent entity from breaking free once again.