Xuan Ming is the seventh prince of the underworld. He was born with the origin of Yin, but he was jointly planted by the God and the Emperor of Heaven to plant a fatal blood curse.
Chang Yi is a direct disciple of the Emperor of Heaven. She is wrapped in the spiritual power of Zhiyang, but she doesn't know that she holds the key to the six realms.
The first time they met Jiuyou, she leaned over and pulled him up from a pool of blood. The white spiritual power inadvertently soothed the severe pain of his bone-crushing blood curse - the antidote he had been looking for for thousands of years turned out to be this little fairy who fell from the sky.
He forcibly brought her back to the underworld, originally for use, but as they spent time together, his heart was broken by her purity, and he caught a glimpse of the softness that had not yet cooled under his murderous shell. In order to protect her, he forcibly activated the source, unleashed a blood curse, and almost lost her soul.
Fighting for life and death together in Wuwu Secret Realm, he was moved and was willing to lay down the butcher knife for her, but he didn't know that the clue of Liangyi Xuanjing would eventually point to her heart.
When the White Emperor launched an attack and the gods surrounded him, she protected him with her life. When a golden pattern appeared on her chest, he was shocked to realize that the one who could save his life was her life in exchange.
He would rather die than take away her life, but he was saved by her when he was about to die, and his memory was tampered with by the Emperor of Heaven - she became the female general Yuehua in the heaven, and regarded him as his mortal enemy; he became the lonely emperor in the underworld, carrying half a mysterious crystal to quell the civil strife, and traveled across the six realms with thunderous means, just to find his true love.
When they met again, she stabbed his heart with a sword, with no trace of the old love in her eyes. He was heartbroken, but he still risked his life to protect her again and again when she was in danger.
The fireworks in the world were tempered, and the past feelings were broken. She finally recalled her past and saw clearly the conspiracy of the Emperor of Heaven and the White Emperor - what they wanted was always the Liangyi Xuanjing in her body.
Let go of the innocence of the past, hold the sword side by side with him, and face the yin to the yin, and break the conspiracy with sincerity.
Intent: Even in darkness, through betrayal and separation, pure love and protection can break the barriers, transcend life and death, and light the way forward for each other.