My Girlfriend Cheated on a Rich Second Generation, but the Other Person Was My Father's Illegitimate Son

My girlfriend disliked the poor and loved the rich, so she cheated on the rich second generation from the school next door. Unexpectedly, when the second generation rich man saw me for the first time, his face suddenly changed, and he arrogantly asked me, an illegitimate son, to kowtow to him and apologize. I was confused, and after seeing the family photo of the rich second generation, I was even more shocked to the point of disbelief. Who would have thought? My dad, who is just a surrogate son-in-law, dares to raise a mistress and an illegitimate child outside?