The Cho tribe has maintained a fragile peace for 200 years by adhering to a single, strict rule: never leave the island lest they encounter the savage Gyui-heol, also known as the Fiendbloods. But the world of the Cho tribe is turned upside down when the Fiendbloods invade, demanding open borders and threatening the island's tranquility. In the midst of this political turmoil stands Mokrin, a young woman who suddenly finds herself the center of an unwanted negotiation.
The invasion takes an unexpected turn when Eonyeong, the formidable and scarred son of the enemy chieftess, lays eyes on Mokrin and falls hopelessly in love. While rumor paints the Fiendbloods as heartless monsters, Eonyeong proves to be a complex figure—a terrifying warrior on the battlefield who is disarmingly innocent and intense in his affections. His sudden proposal offers a potential diplomatic solution, but it places a heavy burden on Mokrin's shoulders.
Thrust into a political marriage to protect her tribe, Mokrin must navigate life among the feared Fiendbloods. As she spends more time with her new husband, she begins to question if the terrifying legends about his people are true, or if love really can transcend centuries of hatred and fear. Mokrin is a captivating tale of sacrifice, cultural clashes, and the unlikeliest of romances blooming in the shadow of war.