The world is divided into yin and yang. The yang world is a world of mortals, with good and evil sects standing everywhere, and grudges are endless. The underworld is a dark and turbid place, where ghosts and monsters run rampant, and reincarnation hides the evil. There is a thing in the world, called the soul-suppressing coffin. It is neither gold nor jade, nor ghost nor immortal. It inherits the legacy of ancient heaven, suppresses all evils in the world, and locks the rift between Yin and Yang.
There has never been a fixed holder of the soul-suppressing coffin, only those who "have deep regrets in their hearts, bear injustices in their bodies, and are lonely in their lives" can attract its power. If the coffin is not opened, the heaven and earth will be peaceful; if the coffin is opened, the stars and the moon will lose their color, the moon on the west tower will be faded, and the yin and yang will be in chaos.
There is a unique place in the world - Xilou Ferry. This place does not belong to the territory of Kyushu and is not under the jurisdiction of Yin and Yang. Every full moon night, the moon shines upside down and the water flows reversely. It is the only overlapping gap between the Yin and Yang realms. There is no day or night, no spring and autumn in the West Tower. It only recognizes the obsessions of people's hearts and does not recognize the laws of heaven. It hides the greatest secrets and conspiracy of the world in all eternity.
