I married the wrong man, and I sent him and his whole family to be executed.

After research by Yu Wangfei and Doctor Fu, they discovered that no poisonous drugs were released from the Imperial Hospital, and Chu Aotian had never taken medicine from the Imperial Hospital.

Thus, the clue ends here.

"Where did he get this medicine called Hedinghong?" Yu Wangfei couldn't help but feel a little confused.

This is not an ordinary poison. It will leave traces as long as it comes into contact with it. Could it be that the eldest prince’s mansion always has a supply of poison?

At this moment, Doctor Fu suddenly remembered something, and he asked tentatively: "Princess, is there any red thorn in the rat poison you made?"

"Rat poison?" Yu Wangfei recalled.

When Huichuntang was first established, rats often appeared in the hall, so Yu Wangfei specially developed a poison to kill rats.

"A few days ago, someone came to the eldest prince's mansion to get medicine. He saw the rat poison I placed in the corner and took it away as well." Doctor Fu recalled what happened at that time.

Because the man was taking some common medicines for treating colds, Doctor Fu didn't take it seriously.

It was not until today that he heard that Madam Gu died of the poison of the red thrush. He had been with Yu Wangfei for a long time and naturally knew the conflict between her and Chu Aotian. Only then did he remember that the servants in the eldest prince's mansion had taken away a bottle of rat poison from him that day.

"It seems so." Yu Wangfei smiled self-deprecatingly.

The rat poison she was researching contained the poison called thiamine. Unexpectedly, Madam Gu was poisoned to death by the rat poison.

"I released the Crane's Beak Poison, and it turns out that he is someone from the eldest prince's mansion." Yu Wangfei looked at Chu Yuheng.

"With evidence, things will be easier." Chu Yuheng took her hand and motioned her to rest assured.

Another day passed and there was no progress in the Dali Temple. Although they found out who bought the poison, they had no direct evidence to prove whether it was a servant in the eldest prince's mansion or Old Madam Gu.

After all, Madam Gu was fine when she was causing trouble in front of the Yu Mansion, and no one from the Grand Prince's Mansion was present at the scene, as could be testified by the people who were watching the incident.

The case is stuck here. Tomorrow is the last day. If we can’t find the real murderer who killed Madam Gu, we will be in trouble.

"Let me try." Yu Wangfei took the initiative to step forward. She already had a plan in her mind.

Apart from the housekeeper, the only people who could get close to Old Madam Gu that day were Madam Gu and Gu Baizhou, so Yu Wangfei suspected that it was the two of them who poisoned the old lady.

"Okay, I'll wait for you outside." Chu Yuheng looked at him reluctantly.

Liu Ruchu nodded in agreement.

At this point, they could only let Yu Wangfei go in for questioning. They had no way to deal with Gu Baizhou.

"Miss, let me go with you." Yunhua wanted to step forward to protect her.

"It's okay. He is just a cripple now and is no match for me." Yu Wangfei patted Yunhua's shoulder, signaling them to rest assured.

After entering the sky prison, Yu Wangfei took a deep breath and tightened his fox fur coat.

The weather was already cold, and it was even colder inside the prison. Fortunately, Chu Yuheng had prepared top-quality fox fur and a hot water bottle for her before she came in.

When Mrs. Gu saw Yu Wangfei coming, she turned her head away in annoyance. Gu Baizhou lay on his small bed, staring at the haystack on the ground without saying a word.

"We meet again." Yu Wangfei took the initiative to pour a cup of hot water for Mrs. Gu and lit another kerosene lamp to make the dim cell brighter.

"The prince and I have found out the truth. We already know who killed the old lady." Yu Wangfei deliberately glanced at the two people's reactions.

After finding that they were silent, Yu Wangfei continued, "Gu Baizhou, you are really capable of poisoning your own grandmother."

Upon hearing this, Madam Gu stood up and pointed at Yu Wangfei, saying angrily, "What nonsense are you talking about, you little bitch? It was you who asked the housekeeper to poison the old lady!"

Gu Baizhou still had no expression on his face, as if there was no one else in his cell, and he ignored the conversation between Mrs. Gu and Yu Wangfei.

"We have already found out. You were ordered by the eldest prince. The Crane's Crown Red was also given to you by the eldest prince. You were the one who killed your grandmother. If the news of a grandson killing his grandmother gets out, your Gu family's century-old reputation will end here. Hahahaha."

"Shut up!" Mrs. Gu became angrier and angrier as she listened, and finally she reached out and hit Yu Wangfei.

Yu Wangfei was quick-witted and quick-handed. He turned around and kicked Madam Gu to the ground.

Seeing his mother being kicked down by Yu Wangfei, Gu Baizhou was extremely angry: "What are you doing? How dare you hit my mother? She is my mother!"

What a joke, this isn't the time for him to talk about his mother.

In fact, Yu Wangfei didn’t understand. Many men always had some prejudice against their mothers before marriage, but became particularly filial after marriage. This change made Yu Wangfei feel strange for a while.

"Yu Wangfei, you bastard, you killed your father-in-law, your grandmother, and crippled your husband. Now you even dare to harm your mother-in-law. You will not die a happier death!" Mrs. Gu cursed.

"I will kill you, I will kill you!" Gu Baizhou struggled to sit up, staring at Yu Wangfei with bloodshot eyes.

"Gu Baizhou, no matter how bad I am, I am not like the scumbags in your family." Yu Wangfei looked at the two with disdain, "Lord Gu sold me to the Seventh Prince in order to climb up the social ladder, and you, as my husband, didn't care."

"You, you." Gu Baizhou didn't know how to respond for a moment. He thought for a while and defended himself, "Father did this for you and for the good of our family. It's all because of you. You don't understand father's painstaking efforts. If you hadn't been disobedient, how could the Marquisate have fallen to this point!"

Until now, Gu Baizhou still believes that everything was caused by Yu Wangfei, and he has never looked for the reason in himself.

"That's right, you bitch, you've married into our family, but you're still fickle. If you had been obedient in the beginning, you and my son would still be a perfect match." Mrs. Gu looked at Yu Wangfei with gritted teeth.

Although Yu Wangfei is Yueying's princess, behind them is Chu Aotian, the future emperor of Great Chu, so Madam Gu and Gu Baizhou are not afraid of Yu Wangfei at all.

"The Seventh Prince just wanted to use your belly. If you were really pregnant with a prince, our mansion would have been prosperous long ago." Gu Baizhou laughed, "But don't worry, although you are following the Ninth Prince now, you two will go to hell together, Yu Wangfei, please beg me, beg me to save you."

As expected, we found out that Gu Baizhou had joined Chu Aotian.

I didn't expect that Chu Aotian would want a useless person. It's ridiculous. Gu Baizhou doesn't even use his brain to think about it. They are just pawns. How could Chu Aotian treat them well?