Why did Mo Zhengyan marry her and why did he choose such a seemingly impossible woman?

They are so similar, and suddenly the Zheng has this insight.

However, in July of Song Dynasty, she didn't hear what she said. The murmur was too light. She just moved her lips. "What did you say?"

The Zheng looked up, and she laughed.'I didn't want to answer your question. It's my private matter. I have the right not to answer you. But if you want to know so much, I will tell you that he is both my brother and my lover."

"As for which one you want to believe, it's up to...