Solo Leveling. Volume 12 (webtoon)

Park Jin-Woo battles three Rulers in the heart of Seoul, but the otherworldly beings prove too powerful, making it impossible to defeat them alone. At the moment when inevitable doom is near, the hunter finally comes face to face with the true source of his power. The Shadow Ruler, the king of the dead, shows him the path he has walked and gives him a choice. A choice that could determine the future of humanity... Does Jin-Woo have the determination to save an entire world? And who is that mysterious person who has always watched over him and protected him?