He figured she was Cheng Weiguo's one and only daughter and Cheng Weiguo mentioned his daughter on multiple public occasions, so she must be Cheng Weiguo's weak spot. He figured that as long as he made her live a life worse than hell, Cheng Weiguo would definitely live a life worse than hell too.
But in the end, while he really made her live a life worse than hell and he really did achieve his objective, Cheng Weiguo was still living just fine in the world. In fact, he lived happily and freely.
He racked his brain planning everything, but he never actually achieved his desired goal.
The person who should've truly been punished never received his punishment. If that wasn't enough, he loved her but didn't dare admit it, and he was afraid he was too captivated by her, so he found a random woman to marry in a hurry. Cheng Weiwan wanted to leave, but what about him? He didn't want to let her go, and he even cruelly raped her...