She's been a mistake since birth
The biological mother was of low status, and she wanted her to be more valuable than her son, so she was stuffed into her ancestral home in exchange for a better future.
Her grandfather was a lunatic and forced her to disguise herself as a man for several years, and finally found her a new father.
………
Since then, the Xiao family has had a fourth girl.
One wrong step, one wrong step
Intention: Self-reliance and self-reliance