In the final years of the Song Dynasty, Mongol forces swept south, and the country teetered on the brink of collapse. Across the Central Plains, the tangled worlds of the martial arts and the imperial court collide. Lin Xiaotian, a young swordsman of the Heavenly Sword Sect, has a mysterious past, an upright character, and formidable martial skills. Cheng Linger, a heroine of the Blue Wave Pavilion, comes from a distinguished family and shares a complicated romantic entanglement with Lin Xiaotian. Mongke, the Great Khan of the Mongols, devises a strategy to destroy Dali and then attack the Song from both sides. He sends Yuan commander Kublai to invade Dali. After Dali falls, Mongke personally leads his troops south, advancing like a breaking wave until they lay siege to Diaoyu Fortress. Martial heroes from every corner rush to its aid. In a great battle, Mongke is gravely wounded and dies that very night. The Mongol army retreats north, giving the Song a few years of peace.
