She knew about that woman, the one her father had married a few years ago, and the boy was their son.
Because these two had been conniving against her in secret for years, her father eventually found out and banished them both from Lin City.
Her father had wanted to sign a divorce agreement with the woman directly, but given that this woman came from a prestigious family, she absolutely refused to let such a scandal of being abandoned come to public light as it would tarnish her reputation.
Therefore, she didn't agree to sign the divorce papers, leading to a stalemate lasting a couple of years.
Cui Ying moved out of the Cui Family home early on, partly to avoid marriage and partly due to the disdain she felt seeing these two.
But to Cui Ying's surprise, they were back, likely because they had heard about the destruction of the Cui Family.