Blade of the Otherworldly Demon

During the execution of his mission, detective Sean encountered a bolt from the blue and was unfortunately hit. After death, his soul traveled through time and possessed a young recruit who was dying. He embarked on his journey to another world, the road to war, the academy trip, the racial war, the undercurrent of the land of gods and demons, and the mysterious organization with unknown purpose. Sean was inadvertently involved in the whirlpools. What kind of story is hidden in the past battle between gods and demons? The undercurrent surging in the shadows, who controls everything? Destined to be extraordinary from the beginning, where will Sean's future go?