Dancing: Why did Qi Zhen accept Yang Mi's Wen Zi as his adopted daughter?

In the TV series Dancing, Qi Zhen could have been the King of Taiyuan, but he didn't expect that his plan didn't succeed, but others beat him to it, so he had to find other ways to deal with his grandson Wuji. It happened that at this time, Sun Wuji told Qi Zhen that today was a whirlwind to save him and asked Qi Zhen to send him to the palace. He thought that whirlwind was Yu Wenzi, so he planned to let him be his pawn. Here's the thing.

In fact, no one in the Woods knows what happened. Only Sun Wuji and Fu Yang know what happened. Sun Wuji was really saved by Fu Yang. Without Fu Yang, Sun Wuji would have been killed, so Sun Wuji came out of the Woods and told Qi Zhen that he met an assassin in the Woods today, but no one came to save himself. On the contrary, Wen Zi, played by Fu Yang, saved himself. He asked Qi Zhen to send Yu Wen Zi to the palace. Qi Zhen knew that he could arrange one more person beside Sun Wuji, so he chose to let Yu Wenzi be his pawn, so Qi Zhen said that he would accept Yu Wenzi as his adopted daughter, so that he could manipulate her to be a pawn.

Wen Zi, who plays the whirlwind, pretends to be true, and recognizes Qi Zhen as the adoptive father. She also knows that the person who has been waiting on her side turned out to be grandson Wuji, and found photos of Xiaoqi and Hannah Quinlivan, so she plans to leave this place. She doesn't want to be a pawn or help Qi Zhen do bad things. It can be seen from Pei Zhen's character that Qi Zhen is not a good man. If, and in order to achieve my goal, I don't know what I will send myself to do in the future.

The above views only represent Bian Xiao's personal views. Please forgive me if there is any mistake.