There is a prophecy: If there is no justice, Yin will be strong and Yang will be weak, and Yang will be unable to suppress Yin, so the universe will change position and all things will be unified.
Darkness devours light, evil overwhelms justice. Two families with a mission, and two young men drawn by fate, point their swords to the sky, make a promise, and play a big gamble with the will of God with the world as their bet.
Sweep away the darkness and support justice, but in the end, you lose the bet and win the world.