One morning, a blue horse is born in the stables of a village. Upon seeing it, the king proclaims it a blessing from God and orders it to be trained into a true warhorse. Blue Wave, as everyone calls it, spreads panic on the battlefield; but with it, the war becomes endless, and the people's joy at seeing it fades amidst famine and suffering. One day, Blue Wave sees himself reflected in the eyes of a young soldier. From that moment on, his destiny is transformed, and his name remains in the hearts of the people with a different meaning. A picture book in which the strength and tension of line and drawing coexist with the symbolism of color. White, black, and blue represent, respectively, goodness, evil, and the ideal. A play of contrasts with which Korean illustrator Yoo Jun-Jae pays homage to Picasso's painting and, in particular, Guernica. Constructed with the simplicity and intensity of a fairy tale, this wonderful story becomes a metaphor for peace, capable of moving readers of all ages.