In her past life and this life, she has lived for revenge, and the black gun is her only friend. He, dressed in white, is astonishingly talented and handsome, but free and uninhibited; he is lonely, cold and arrogant, with a deep chest, but he is persistent, self-controlled and almost indifferent. Who meets whom first, who knows whom first, who falls in love with whom first, and who stays with whom forever? Are you committed to a peaceful world, or are you traveling among rivers and lakes? Should you persist for love or give up for love? Is it love or hate?