Shen Biran understands the Si Family's methods deeply; Elder Si will not allow Gu Xiaonuan and Si Yuchen to divorce.
After divorcing Si Yuchen, the custody of the child will not be given to them.
Si Lingtian used the child to achieve his goal of saving Si Yuhao. The goal was achieved, and the child is still alive, which was unexpected for Si Lingtian but made him re-evaluate the importance of this child.
The child carries the Si surname, not Gu.
Gu Xiaonuan still doesn't understand now, if she later learns that her child with Si Yuchen is still alive, will she divorce, leave Sea City, and go to another city to live in seclusion with Shen Biran?
Impossible, based on Shen Biran's understanding of her daughter, such a situation is unlikely to occur.
Shen Biran arranged a smooth path for Gu Xiaonuan, as long as she can obey, then she won't follow the old path she once took.