To be absolutely clear: they are not related by blood, they are not related by blood, they are not related by blood.
There is some angst!!! The female lead grows stronger later on.
She had once been trapped in a shattered mire, and should have been like a frightened bird, avoiding even the faintest glimmer of light. Yet the gentle voice calling her "Xixi" again and again was like a spring breeze, quietly entering the heart she had kept closed and beginning to change her.
He was forceful yet tender, like a warm, sturdy wall, surrounding her as she curled up in a corner. By his side, her heart was full of conflict. On one hand was the instinct to run away, a habit carved into her by past pain. On the other was an irrepressible longing, a wish for this warmth to last forever. Trembling, she reached out, as if trying to grasp this rare happiness. But fate was so cruel, shattering every beautiful thing as easily as glass. She and he fell in love, and she thought their love was a light of salvation in her dark life, one that could lead her out of an endless abyss. But she never imagined it was all just a beautiful dream. When she woke, only endless bitterness and regret remained. Even so, neither she nor he ever regretted it.