Kim Seokjin and Kim Hana Mae are the children of one of Korea's most ruthless mafia leaders. When Jin is 15 and Hana Mae is 5, they get separated by their parents' divorce. Ten years later, Hana Mae is living a new life with her mother, stepfather, and stepbrother, Jungkook. Jungkook is like her twin, born on the same day, they're the same age, and they're extraordinarily close. Hana Mae only remembers that she has an older brother out there that she misses, but nothing else about her family before the split. What will happen when Jin and his group are sent to bring Hana Mae back to Seoul, eliminating anyone who stands in the way?