This was indeed a terrible idea.
Xu Enyu's death was an accident; she committed suicide—it wasn't homicide.
Bai Yuning is not a murderer, and He Zhiyao, whom she kidnapped, is alive and well.
In terms of sentencing, she won't serve more than ten years in prison.
He Linze wants Bai Yuning to pay with her life; that's absolutely impossible.
Thus, following legal procedures, he simply cannot achieve the outcome he desires.
Bai Yuning is a living person, not some object to be disposed of at his will.
So his idea for Bai Yuan to replace Bai Yuning in prison is truly absurd.
Any normal person would never agree to it.
Even if there were extraordinary circumstances in which someone might take another's place in prison, it definitely wouldn't be in a case like Bai Yuning's.