"This undergarment has lily of the valley pollen on it?" The Fourth Prince was so busy looking at it that he didn't notice Lanqin's expression, nor did he pay attention to the expressions of the Fujin and Madam Yin.

“Your Majesty, I have searched the Third Prince’s room and found only bellflower pollen on this undergarment. The undergarment has a wool lining, and the pollen is extremely fine, so it doesn’t easily fall off,” Wu Youcai said.

Lanqin frowned slightly. This undergarment was a piece of fabric she had personally selected from the batch of fluffy Korean satin that had been presented as tribute to Korea a few months ago, and made for the Third Prince to provide him with a similar warm undergarment. She hadn't expected them to target this fabric today; it seemed they were indeed after her after all.

Before the Fourth Prince could ask any questions, Lanqin stood up from her seat and said to him, "Your Highness, this undergarment was made by me and the maids and was a gift for the Third Prince. But I have never done anything to it, nor have I used any lily of the valley pollen. Please investigate, Your Highness."

Both Song and Geng stared in astonishment at Lanqin's retreating figure. Cui Niang stood behind Lanqin, staring blankly at the undergarments inside the wooden box in that house.

Fourth Master looked at Lanqin with slight surprise, momentarily speechless. Lanqin met Fourth Master's gaze, her face unusually calm. She believed Fourth Master would believe her; this clumsy trick was clearly a deliberate setup. How could someone as perceptive as him not see through it?

"My sister says she didn't do it, but do you have any proof?" The Fujin asked when she saw that the Fourth Prince was silent.

Lanqin kept staring at the Fourth Prince. Seeing that he didn't say anything after the Princess Consort asked him a question, she felt a dull pain in her heart, as if a thorn had been pierced.

"It's very simple," Lanqin said loudly. "Judge Yang said that the poison from the lily of the valley pollen began to enter the Third Prince's body several months ago, and the poison gradually worsened day by day. The Third Prince has worn this undergarment several times, and each time he took it off, he would wash it in water and then expose it to the sun. How could the pollen not fall off? You might as well ask the Third Prince how many times he has worn this undergarment in the past few months. How could the poison on this garment gradually enter his body?" She was truly disgusted by the methods of the Fujin and Yin Shi. They didn't even understand such a simple principle, yet they were harming people here. They were simply courting death.

Upon hearing this, the Fujin's expression changed slightly. She glanced at Madam Yin a few times, thinking bitterly, "She's more trouble than she's worth."

Yin stood there dumbfounded, preoccupied with sprinkling the poison powder from the medicine bottle onto the things Lanqin had brought, without giving any thought to how to do it flawlessly and convincingly.

"Furthermore, I can also say that I did not poison this undergarment when I delivered it. It's just that the garment was delivered to the Third Prince's room, and anyone who came into contact with it could frame me," Lanqin added.

Looking at Lanqin's retreating figure, Cui Niang felt relieved. Her mistress might seem unreliable at times, but she actually had a lot on her mind. Song Shi and Geng Shi also breathed a sigh of relief; they had just been worried about her.

"My lord," the concubine said, pressing further, "since the concubine has no direct evidence to prove her innocence, I urge you to order a thorough investigation of the South Courtyard. Have all the maids who serve the concubine examined one by one; perhaps some of them will not be able to withstand the pressure and will reveal something."

Lanqin stared at the Fujin and immediately said, "My lord, as I just said, we only need to check if the pharmacy in the manor has any bellflower powder, or we can check all the major pharmacies in the capital to find out who has been in contact with it. As for the pottery jar, the same applies. We can take the broken pottery jar to all the pottery jar-making places in the capital to inquire. This thing is so special, I believe the people who made it will definitely be able to find it."

Madam Yin trembled slightly. She had just thought that this matter could be avoided for the time being, but she did not expect that Lanqin would bring it up again.

The princess was about to speak again when the fourth prince interrupted her, saying, "Su Peisheng, take those broken pottery shards and go door to door with people to ask around. You must find out who made these things."

Upon hearing Fourth Master's words, Lanqin was startled. Behind her, Cui Niang, Song Shi, and Geng Shi also gained more confidence. As long as they could find out who made the exquisite pottery jar, everything would become clear.

At this moment, Madam Yin was so filled with remorse that she wished she could bite off her own tongue and swallow it. Why didn't she let Ye Ying take the things away sooner?! It's likely that the Fujin was thinking the same thing at this moment. She was too lazy to look at Madam Yin anymore and only said, "My lord, I have something here. If you take a look at this, you can be sure whether the concubine has plotted against the Third Prince."

Lanqin felt her throat go dry. She couldn't imagine what the Fujin might have, so she remained silent, waiting for the Fujin to take out what she claimed to be.

The princess consort gestured to Lingxiu to fetch a small sandalwood box from inside the house. Lingxiu raised her hand, which was adorned with kingfisher feather enamel nail guards, and her expression and posture were incomparably elegant and graceful.

"My lord, this is a letter left by Mingyan, the maid of the late Lady Li. It was written by Lady Li to the Third Prince before she died. I heard from Sister Yin that the Third Prince once took this letter to ask the Consort about it. I wonder if the Consort acknowledges it?" The Consort picked up a piece of paper from the box and handed it to the Fourth Prince.

The Fourth Prince stared in disbelief at the piece of paper his wife handed him, but instinctively took it. As he unfolded it, his expression gradually changed.

"My lord, you are most familiar with Li's handwriting. Is every word on this page written by Li?" the Fujin asked.

Lanqin knew about that letter. The Third Prince had indeed come to her with it and asked her personally if she was the one who killed his mother. She had given him a clear answer and told him that the person who killed Li was someone he couldn't touch. She told him to study hard so that he could seek justice for his mother in the future.

Why would the Third Prince give that letter to his wife? They had clearly agreed to protect each other and wait for the right opportunity! Could it be that the Third Prince gave the letter to Lady Yin?

Lanqin's mind was in complete turmoil. How could she possibly bring up those words she had spoken to the Third Prince back then? Besides, the Fourth Prince had already determined that Li Shi's death was the work of Granny Li, and had nothing to do with the Fujin (the Princess Consort). If she were to bring up those words again, she feared even the Fourth Prince wouldn't be able to accept it.

Standing to the side, Madam Song could no longer contain herself and stood up, saying, "Your Majesty, you have already made your judgment on how Madam Li died. Those who should be punished have been punished. Now, this letter has appeared out of nowhere, accusing the concubine. It is truly suspicious."

Upon hearing this, Lanqin immediately sensed something was wrong. Sure enough, the Princess Consort quickly interjected, "I wonder how Consort Song knew about the woman mentioned in this letter? I didn't read it aloud. But did Consort Song also see this letter?"