I would argue that the series itself presents these dualities as fundamental aspects of the universe, on par with how Daewi manipulates the four fundamental forces. When Mujin mirrors Daewi’s approach, he explicitly frames his technique in terms of cosmic dualities (Yin and Yang, Taichi and Wuchi, Light and Darkness, Emptiness and Annihilation). The fact that these concepts are not treated as symbolic metaphors but instead as operative forces in combat indicates that the story acknowledges them as real structural components of reality.
If Daewi’s use of physical forces represents one scientific framework for the universe, Mujin’s dualities represent the metaphysical framework, and the series treats both as equally valid lenses for universal law.