I became a concubine in the palace and cured my master's hidden disease.

Guard Cao lit the old oil lamp on the table, and the faint light illuminated the entire room. Zhao Yuan looked around and his eyes fell on the tidy bed. The quilt was neatly folded, as if no one had ever touched it. His fingers gently stroked the bed surface, and a layer of light dust immediately emerged, which meant that no one had slept in this bed for several days.

Then, Zhao Yuan cast his eyes on a chair next to him, and his fingers slid across the back of the chair, also bringing out a layer of light dust. He couldn't help but frown, and a sense of doubt surged in his heart.

"Are you sure that Liu Chang's men entered the house?" Zhao Yuan turned around and asked Guard Cao.

"I followed him all the way and saw him enter the house with my own eyes, and then I came back to report." Guard Cao replied quickly.

"Has there been someone watching over the entire process?" Zhao Yuan continued to ask.

"Reporting to the prince, I have sent people to keep an eye on this place and confirmed that Liu Chang has not left since he went in. There was also an old man selling roasted sweet potatoes who was selling things with a load on his shoulder and he also showed his face." Guard Cao said affirmatively.

"Oh! Could there be a secret passage or something like that?" Zhao Yuan suddenly thought of this possibility and asked hurriedly.

"Several of our subordinates thought so too. We have searched everywhere carefully and did not find any suspicious signs or secret passages." Guard Cao answered truthfully.

Zhao Yuan frowned and fell into deep thought, with more and more questions in his mind. Where did this person go? Why did he disappear without a trace after entering the house? Could it be a ghost or a demon who can disappear?

"Let's go back first." Zhao Yuan said. He believed that people could not disappear out of thin air, and they must have left in some way he didn't know. He asked A Yan to see if she had heard of similar cases.

"Send a few people to find a way to sneak into Prince Heng's mansion." Zhao Yuan immediately gave the order after returning to Prince Rui's mansion. Then he sat alone in the study, thinking over and over, but still couldn't figure out a clue.

At this time, Lin Yan walked into the study room carrying a bowl of bird's nest porridge. Seeing Zhao Yuan's worried look, she asked with concern, "What's wrong? Why are you so worried?"

Zhao Yuan raised his head and replied, "It's nothing, it's just that Liu Chang suddenly disappeared, and I have some questions in my mind that I can't solve. Tell me, how can a living person disappear from a closed room?" After asking, Zhao Yuan took the bird's nest porridge, picked up the white jade spoon, and slowly drank it.

Lin Yan frowned tightly and muttered to herself. She was familiar with Conan's story, and similar methods appeared endlessly. As for what method Liu Chang used to disappear without a trace, it was really difficult to judge accurately. "I have heard of some methods, but only heard them."

"Oh? Tell me about it." Zhao Yuan suddenly became interested.

"In fact, the so-called completely enclosed space does not exist. There must be a breakthrough point, or a time difference must be used to create auditory or visual illusions for people outside." Lin Yan analyzed clearly.

Zhao Yuan nodded in agreement: "What you said makes a lot of sense. Keep going."

"I think that Liu Chang is either dead or has managed to escape from our sight. However, I guess there must be a third key figure, and this person may be insignificant and easily overlooked, so we all ignored it." Lin Yan deduced calmly.

Zhao Yuan slapped his thigh fiercely and said, "You are right! When Guard Cao returns, I will definitely ask him about this in detail."

"What about Mr. Zhao Si? Have you considered interrogating him?" Lin Yan asked.

Zhao Yuan's eyes lit up, and he slapped his head, saying to himself, "Oh, how could I forget about him!" He then put down the bird's nest porridge in his hand, stood up excitedly, patted Lin Yan's shoulder, and hurried out of the study. "You are really my lucky star."

Zhao Yuan came to the dungeon in black clothes and a mask, and saw the beaten and bruised Zhao Siye. Zhao Siye looked at him in horror and kept begging for mercy.

Zhao Yuan's voice was low and cold, as if he had instantly become another person. He asked coldly, "Tell me, why did you collude with the scoundrel to frame Prince Rui?"

Fourth Master Zhao trembled all over and stammered, "Yes, it was the Princess Mu of the Rui Palace who asked me to do this. She said that Concubine Lin in the palace had made her so angry that she was about to have a miscarriage, and she could come and go in the palace at will. What woman in the backyard could be so presumptuous and disrespectful to the princess? As long as I couldn't let the casino open smoothly and embarrassed Concubine Lin, she would give me some money. So, I asked the scoundrel monkey and the others to go to the casino to make trouble. Who knows why the scoundrel monkey suddenly died?"

Hearing these words, Zhao Yuan's heart was shocked. How could it be her? His eyes became extremely cold, staring at Mr. Zhao Si, "Do you think you can get away with it by saying this?"

"I really didn't tell a single lie! Princess Mu gave me one thousand taels of silver in advance, and I didn't have time to use it at home before you captured me. Please spare my life, hero. Let me go. I don't want the one thousand taels anymore. I'll give it all to you."

"Hmph, I heard that you have a good relationship with King Heng." Zhao Yuan suddenly changed the subject.

When Mr. Zhao Si heard this, his eyes flickered for a moment, but he still pretended to be calm and spat out a mouthful of saliva in disdain: "Who in the whole capital doesn't know that I don't get along with him? That guy is a hypocrite, a good person in front of others but a devil behind their backs. He has done so many dirty things behind my back, and no one knows except me. He has tried to kill me three times, but unfortunately he has never succeeded. Yet people still regard him as a modest gentleman."

Zhao Yuan ignored Mr. Zhao Si and turned away. He was full of thoughts, and never expected that Mu Xueli was behind all this. Thinking carefully, she did have a motive for doing this.

If Mu Xueli just wanted to cause a commotion in the casino and disgust A Yan, it would be difficult for her to punish her too severely. After all, now was not the right time. Everything should be decided after she gave birth.

If it was said that Fourth Master Zhao had only wanted to make a small fuss, it would also make sense that the lazy monkey had a sudden illness. But how could Liu Chang disappear for no reason, and how could there be the shadow of Uncle Ye among them? These things made Zhao Yuan feel uneasy.

In the end, Mu Xueli was confined to the Dream Courtyard for three months, and all affairs in the palace were handed over to Lin Yan. It was announced to the public that Mu Xueli's pregnancy was unstable and she needed to stay in the palace to protect the fetus.

Lin Yan only then realized that the instigator of the casino turmoil was Mu Xueli. She had to admire her. This woman was really good at making trouble.

Mu Xueli was so angry that she smashed everything in the room. She hated Zhao Siye so much that he asked her for five thousand taels, but she couldn't even handle such a small matter. In the end, he gave her away. She was so angry that she swore that she would never let Lin Yan have an easy life.

The casino fight was over. Life went on, and suddenly everything was calm again.