As for his son Guo Sian and Tan Xiaoxiao, Yi Anguo feels that once Guo Sian finishes his studies and returns, maybe he would have already found someone he likes during his time at school.
By that time, Tan Xiaoxiao will be over thirty, and she might have already found her match, or even gotten married and had children.
Even if she's not married, a woman in her thirties is not young anymore, and his son probably won't be interested in her anymore!
So now, Yi Anguo is not too worried, and he doesn't insist on forbidding any contact between his son and Tan Xiaoxiao.
Yi Anguo knows well that boys at seventeen or eighteen are at their most rebellious phase; the more you oppose, the less they listen, and they might even escalate the situation to be with the other person more.
