Su's father brought his old friend's son home to raise him. Su Xingyue was reminded by the rich kids in her circle that he was probably her father's illegitimate son. Who would take a sponsored child home?
Su Xingyue had hated her brother for many years because of the "illegitimate child" incident.
Su Xingyue met a heartless scumbag and accidentally got together with an "illegitimate child", and was strongly condemned in her heart.
Just when she was about to put everything back to normal, she discovered that this brother was really the son of her father's old friend...
Intention: the person in front of you