Su Yan was clearly startled; she hadn't expected such a face to be hidden under the cloak.

"Scared?" the River Goddess asked with a smile.

Su Yan shook her head. "I grew up surrounded by corpses. I've seen all kinds of bodies. Scars are nothing new to me."

"Are you a coroner?" the River Goddess pressed.

Su Yan nodded. "That's right. Can you tell me how you knew I was disguised as a man?"

Grandma He smiled calmly, "It wasn't me who figured it out, it was me who smelled it. Men and women smell different. You clearly have a woman's fragrance."

After saying that, Su Yan raised her hand and smelled the clothes. She could only smell a faint sulfur smell. She couldn't tell what kind of womanly scent the River Goddess was talking about.

However, Su Yan didn't pay much attention to it.

He pulled a box containing fabric from his bosom and handed it to the River Goddess. "Was the contraceptive incense on the clothes made by you?"

The old woman didn't immediately take the box. Instead, she tapped the table beside her and said with a smile, "Miss, I'm an honest person. Treatment costs 1,000 taels, and medicine costs 500 taels. I only accept cash, not banknotes. That's my rule..."

Su Yan immediately understood the River Goddess's implication and took out the silver she had prepared beforehand and placed it on the table.

"Here are five hundred taels of silver, please count them..."

The old woman reached out and picked up the money bag from the table, then weighed it in her hand. It was indeed five hundred taels of silver.

With a smile on his face, he opened the box, took out the tattered fabric inside, and sniffed it.

"That's right, it is indeed the contraceptive incense I made myself. However, it is not incense, but a medicine that I specially formulated. This is a prescription that I specially made for people who have had a disease since birth. Long-term use can also preserve youth and prolong life."

However, there is one crucial point: once taken, it must be taken for life. If one attempts to conceive, it will deplete one's vital energy and accelerate aging. Therefore, those who choose to take this medicine I have prepared cannot have children in their lifetime. Furthermore, after taking it, the body will emit a unique fragrance, hence the name "Contraceptive Fragrance."

"Can this contraceptive incense be taken by both men and women?"

The old woman nodded. "This medicine has no contraindications, but most people who take it are women."

Hearing what the River Goddess said, Su Yan fell into deep thought. According to Princess Jingning's description, the person who kidnapped her was a man, and none of the Rouran envoys had the same scent as the contraceptive fragrance.

Moreover, Zhang Lanzhen also had the scent of contraceptive incense on her body. Su Yan thought about it for a while and realized that none of the Dark Moon Pavilion people who had been in contact with her had this scent.

The clues about the murderer were becoming increasingly bizarre, which put Su Yan in a difficult position.

Su Yan decided to set her sights on the River Goddess.

She pulled out another bag of silver from her bosom and placed it on the table. "Grandma He, I want to know who has bought contraceptive incense from you."

Upon hearing this, the old woman's face darkened instantly. Without saying a word, she simply stuffed the silver back into Su Yan's hand.

“Young lady, although I value money more than anything, I can’t afford to lose my life. I dare not do this business with you.”

Undeterred by the rejection, Su Yan stuffed the silver back into the River Goddess's hand. "River Goddess, you don't need to tell me who used the medicine. Just tell me what characteristics a person who takes the contraceptive incense will have. That shouldn't be too difficult..."

After pondering for a while, He Po felt that Su Yan's words made some sense. "There's nothing special about taking the contraceptive incense. It just makes the body emit a strange fragrance. If too much is taken, the fragrance of the contraceptive incense will remain on the body of anyone who comes into contact with the person who took it."

Su Yan frowned. "You mean the contraceptive residue on this fabric isn't necessarily left by the person who took the drug, but could also be left by someone who had contact with the person who took the drug?"

The River Goddess nodded. "That's not wrong either..."

"I understand, thank you for your guidance, River Goddess..."

After saying that, Su Yan turned and left the wooden house, heading towards Chen Yao's direction.

After Su Yan left, the corner of the wall behind He Po suddenly opened, revealing a hidden room inside.

A mysterious figure wearing a blue mask emerged from the dark room, gazing at Su Yan's retreating figure in the distance.

Upon seeing the man in the blue mask, He Po immediately knelt before him and said respectfully, "Reporting to the Pavilion Master, I have informed Miss Su Yan as you instructed."

The man in the blue mask waved his hand, "I understand, you may leave..."

"Your subordinate obeys..."

After saying this, the River Goddess left the house.

The man in the blue mask stood at the window, his gaze fixed on Su Yan, his eyes revealing an unusual kindness.

Su Yan, on the other hand, instantly understood how the murderer had orchestrated Wulemu's death because of He Po's words.

First, the murderer disguised himself as Ulemu and kidnapped Princess Jingning in public. Then, he orchestrated for the princess to lose her virginity to Ulemu. In front of witnesses, he killed the Rouran prince in a fit of rage, thus instigating conflict between Rouran and Daliang.

Therefore, the person Jingning stabbed was the murderer, not the real Ulemu. This explains why there was only a fatal wound on the body, and no stab wound from Jingning.

After thinking it over, Su Yan realized that she knew someone in the Dark Moon Pavilion who was similar in build to Ulemu.

That is Yu Liuli, who has not yet been apprehended since her life of debauchery was shut down.

Su Yan told Shen Yao and Xie Yu about the situation.

"You mean Yu Liuli disguised herself as Wulemu and then killed him?" Xie Yu asked, his mind completely confused.

Su Yan nodded. "I smelled this contraceptive incense on Zhang Lanzhen, but she is an orphan with no savings. How could she afford such a valuable contraceptive incense? Besides, she is healthy and has no need to take it."

Lord Shen, do you still remember the master that Zhang Lanzhen mentioned before she died?

Shen Yao nodded, "Of course I remember..."

Although Xie Yu was completely confused, he seemed to understand something. "Could the master you're talking about, Zhang Lanzhen, be Yu Liuli?"

“No…” Su Yan decisively interrupted Xie Yu’s guess, “Dean Xie, we were both undercover agents around Yu Liuli. Did you ever smell a strange fragrance on him?”

Xie Yu shook her head, "No..."

"That makes sense. The person who killed Wulemu must be Yu Liuli, but the person with the contraceptive incense is very likely the mastermind behind this case, and holds a high position in the Dark Moon Pavilion..."

Upon hearing this, Xie Yu's eyes lit up with an unusual light, but it quickly vanished, and his face was filled with disappointment.

"We haven't even caught Yu Liuli yet, let alone find someone carrying a contraceptive incense. It's like looking for a needle in a haystack. Where do we even begin..."

As soon as Xie Yu finished speaking, Shen Yao seemed to sense the strangeness around him. He drew his sword from his waist, looked around alertly, and said to the two people beside him in a deep voice, "No need to look anymore, it seems to have come to us on its own."