Lu Yanluo's face was solemn. In order not to alarm the outsiders in the mansion, she collected the medicine residue herself and quickly went to the study where Chu Xuan was.

Inside the study, Chu Xuan looked suspiciously at the person who suddenly came in, not understanding why: "What happened? He looks so ugly."

Lu Yanluo carefully checked the windows around the study, and after confirming that no one was eavesdropping, she carefully took out the poison residue she had just found.

"Come and take a look at this." Lu Yanluo's voice was a little hoarse, perhaps because she was nervous or because she walked too fast.

Chu Xuan seemed to sense something, his face suddenly became serious, and he hurriedly walked over from behind the desk.

"This is... this is medicinal residue! Where did you find it?" Chu Xuan's tone unconsciously became heavy.

What the two had predicted turned out to be correct. The other party was not just targeting the emperor, but wanted to kill two birds with one stone. Now that the first eagle was about to die, they began to plan for the second one.

Lu Yanluo was still afraid, and she spoke with some self-mockery unconsciously: "A place that is easily overlooked by you and me - Yun Yayuan. This thing was dug under the floor tiles of Yun Yayuan. Speaking of this, you have to thank your precious daughter. If your daughter hadn't been playing in the yard and accidentally tripped, I'm afraid we would still be kept in the dark when they came to arrest us."

Yun Yayuan has always been a special place in the palace. Lu Yanluo usually lives there with her two children. Chu Xuan is very cautious and has secret guards everywhere to protect it at all times. So after something happened, neither of them suspected that Yun Yayuan would be tampered with.

Chu Xuan only felt waves of chill sweeping over him. If the other party was here to kill people, Lu Yanluo and the children would probably have been killed by now.

Lu Yanluo understood that Chu Xuan was afraid, but now was not the time to think about these things. She picked up a teacup, put some of the medicine residue in it, and then picked up the teapot to pour water.

Although the residue had no medicinal effect after being boiled, it was enough for Lu Yanluo to find out what the poison was.

Under Chu Xuan's shocked gaze, Lu Yanluo took a sip of the water soaked with the medicinal residue.

"What are you doing! Spit it out!"

Chu Xuan was extremely anxious, but Lu Yanluo was very calm. She picked up an empty teacup, spit the water in her mouth into it, and then said, "If I'm not mistaken, this poison comes from a plant called Nanli Grass in southern Xinjiang."

"This thing tastes sour and bitter. The leaves are not poisonous, but the rhizomes are poisonous. If you eat it by mistake, the blood will surge up and you will die from bleeding. If it is mild, it will be like your majesty, which is no different from tuberculosis."

"Nanjiang..." Chu Xuan suddenly realized and sneered, "Nanjiang, Concubine Xian probably thought that others had forgotten her origins."

Before entering the palace, Concubine Xian was a princess from southern Xinjiang.

Thirteen years ago, Southern Xinjiang was conquered by Tianji Kingdom and became a vassal state of Tianji. To show his loyalty, the King of Southern Xinjiang gave his daughter to the Emperor and she became a virtuous concubine, in exchange for thirteen years of peace in Southern Xinjiang.

Now it seems that Concubine Xian is so anxious to clear the obstacles for her son that she is willing to expose all her past.

Now that I know the whole story, this bag of medicine residue has become a hot potato and must be disposed of as soon as possible.

Lu Yanluo sealed the paper package properly and called Xiao Ran over: "Dispose of this secretly. Be careful not to be discovered by others."

Upon hearing this, Xiao Ran carefully put the paper package in her sleeve and retreated quietly.

Before the two people in the study could breathe a sigh of relief, there was a loud noise outside. Lu Yanluo and Chu Xuan looked at each other and hurried out to check.

The courtyard was full of imperial guards, and the mansion was surrounded by imperial guards. Chu Han, wearing a python robe and standing with his hands behind his back, looked more fierce and majestic.

"Third brother." Chu Han's face was tense, and he said loudly, "Father's condition has worsened. Today, the imperial physician found that Father was poisoned by Nanli grass when he examined his pulse. Then he found the residue of Nanli grass in the medicine bowl. Someone has bad intentions and is trying to murder His Majesty. Today, I have been ordered to thoroughly investigate the entire capital. I hope Third brother will cooperate with my younger brother's search."

Chu Xuan looked around and said sarcastically, "Sixth brother, are you here to search the house or investigate a case? I'm afraid you are going to lead people straight to the Night King's Mansion."

Chu Han unconsciously tightened his hands behind his back; he was a little afraid of Chu Xuan.

When he was very young, Chu Xuan had already led troops to the battlefield to kill the enemies. Every time they met afterwards, he felt that there was a murderous aura in Chu Xuan, which was far more frightening than his father sitting in the Golden Palace.

But at this moment, the imperial guards behind him undoubtedly gave him the confidence to compete with Chu Xuan.

"Third brother, you are joking. As the saying goes, if you don't do anything wrong, you don't have to worry about ghosts knocking on your door. Since Third brother didn't do anything wrong, why would he be afraid of us searching?"

Chu Xuan's face darkened: "Of course, I am not afraid of your search, but I am afraid that someone with ulterior motives will do something unjust and have ulterior motives! Today, I want to see who dares to act recklessly in the Night Palace!"

Chu Xuan's expression changed immediately, and he stared at Chu Han coldly, looking intimidating without even getting angry. The palace soldiers immediately rushed out from both sides, waiting with swords drawn.

For a moment, the situation in the courtyard was tense, with both sides confronting each other and neither side willing to back down.

Chu Han felt a chill on his back and became scared in an instant, but something in his sleeve reminded him.

He slowly took out a bright yellow imperial edict from his sleeve and pretended to be calm: "I am following your orders! The Night King wants to stop me? Could it be that the Night King is going to disobey your orders?"

Chu Han took the imperial edict given to him by the emperor before leaving the palace, and used it to force Chu Xuan to submit.

"You!" Chu Xuan's face turned ashen, with veins popping out on his face. It was obvious that he was really angry.

Upon seeing this, Chu Han quickly retreated behind the imperial guards, hiding among them and showing off his power to Chu Xuan.

Lu Yanluo saw everything, stretched out her hand to stop the furious Chu Xuan, and then smiled slowly: "Don't be upset, Your Highness, Prince Liang is also worried. Since Prince Liang wants to search, then search. People often say that a person with a clear conscience is not afraid of his own shadow. Is that right, Your Highness?"

"Princess, you are very reasonable. Someone, search for me!"

Following Chu Han's order, the imperial guards divided into several groups and began searching the palace, leaving no corner untouched.

Unfortunately, in a corner that no one noticed, Xiao Ran had already secretly handed the medicine bag to the secret guard in the mansion. The secret guard disappeared silently on the spot like a huge black bird.

In the courtyard, Xiao Ran quietly appeared behind Lu Yanluo and nodded secretly.

Lu Yanluo turned to look at the imperial guards busying about in the yard and sneered.

[It seems that this dog emperor really doesn't have many days left to live, forcing Concubine Xian and her son to use such inferior means to deal with Chu Xuan.]

[It's a pity that I'm destined to return empty-handed today! ]

Chu Xuan turned his head to look at Lu Yanluo, and the two smiled at each other.