Three thousand years ago, there was a war between immortals and demons. Demon Lord Ye Yuan wreaked havoc on the three realms, and the immortal Gu Weichen was ordered to suppress it. She sacrificed herself, pierced the heart with a sword, and sealed the demon king's soul into her body. But she couldn't bear to completely obliterate this person with whom she had a mortal marriage, so she kept a fragment of his soul and let him reincarnate.
She herself was seriously injured and the seal backfired, her spiritual roots were shattered, her soul dispersed, and she fell into reincarnation.
Three thousand years later, she was reincarnated as an orphan with a broken spiritual root. He, the reincarnated soul, found her and brought her back to Qingluan Peak.