Sixteen-year-old Jae Hwa Lee is a Korean-American girl with a black belt, a deadly proclivity with steel-tipped arrows, and a chip on her shoulder the size of Korea itself. When her widowed dad uproots her to Seoul from her home in L.A., Jae thinks her biggest challenges will be fitting into a new school and dealing with her dismissive Korean grandfather. Then she discovers that a Korean demi-god, Haemosu, has been stealing the soul of the oldest daughter of each generation in her family for centuries. And she's next.