Jiang Yuejian is burdened with the Moon Death Curse, and Lu Guichen is the exiled descendant of the Nine Suns Heavenly Vein. He forgot everything but her temperature. After ten years of companionship, he hid his edge and paranoia and was willing to be her shadow.
It wasn't until the conspiracy tore through the warmth that he revealed his cold side - all the protection and cleaning in the dark, just to make her belong to him alone.
The curse and the heavenly vein are in conflict, but they are the deepest entanglement of fate. He cleared the way for her to return to Xianzhou to hold the sword, and she broke the curse and was reborn in the wind and frost, insisting on being by his side.
From relying on each other for life, to relying on each other for life and death. If the world hurts her in the slightest, he will burn it into light to illuminate her path forward.