The prosperous city may seem bright and beautiful, but in fact there are undercurrents, hiding countless injustices and dangers, as well as unexpected warmth and bonds. Four people with completely opposite personalities and extremely contrasting souls are tightly bound by the threads of fate. They meet and get to know each other in the fireworks world and in the dangerous environment of wind and rain. They collide with passionate sparks that ignite the whole city, and write an urban legend in which excitement and warmth are intertwined, and edge and tenderness coexist.