In the Northern Sea there is a fish called Kun. The Kun is so vast that no one knows how many thousands of miles it spans! The “Three Elders of Beiming,” the last treasures of Beiming Sect, the greatest cultivation sect under heaven, have mysteriously disappeared. Its sole successor, Ma Mingxiao, has also suffered soul damage and lost all his cultivation. With the sects of the world leaderless and on the verge of collapse, the demon race joins forces with the underworld powers of the mortal world to sow chaos, hoping to upset the balance of the Three Realms and make the demons supreme. Ma Mingxiao lies low in Xingcheng and marries into a family, vowing to restore his sect’s glory. His journey of cultivation becomes a life-or-death struggle between demons and the righteous path, justice and darkness.