Kang Keren suddenly realized and nodded, looking at Gu Yunru with some concern.

"By the way, Princess, I have some throat lozenges here. You can try them."

Kang Keren generously took out the things in her arms. Gu Yunru stared at the throat lozenges, looked left and right, and swallowed them without any doubt.

If she had known this earlier, she could have made some Sterculia lychnophora.

However, when she thought that information about medicine could easily be plagiarized, she gave up the idea.

"Princess, there has been no news from the government office, and we don't know who deliberately set the fire."

Qing Xing listened to Kang Keren's words and followed up with, "Miss Kang, why do you think someone set the fire on purpose?"

"Because I found several footsteps." Kang Keren rushed to the scene as soon as possible. After observing for a week, he found that Master Cheng Shaoyuan was also nearby. So the two of them went into the warehouse together and found someone jumped in from the window. They also found several footprints outside the window.

Hearing Kang Keren's recollection, Gu Yunru slammed the table. She didn't expect it to be just as she expected. Could it be that his enemies did it? All of this was possible. The first person she thought of was Xie Changyong. Could it be this despicable villain?

"Princess, what's wrong with you? Please don't scare me." Qing Xing looked at the princess who suddenly became irritable and shrank her neck in fear. The princess has always had a gentle temperament, which sometimes makes people confused.

"Ahem." Gu Yunru wanted to say a long sentence, but he really couldn't utter so many words, so he asked Qingxing to bring paper and pen, wrote down everything he was thinking on the paper, and handed it to Kang Keren.

"Princess, do you want to investigate this case with Master Cheng?"

"kindness."

Gu Yunru looked at Kang Keren in front of him with a determined look. Kang Keren put the paper ball away and nodded, "Okay, if I see Master Cheng next time, I will show him what you wrote."

"Um."

There was nothing else to say except gratitude. After Gu Yunru watched Kang Keren walk away, she happened to see Qingfeng walking in. Her eyes lit up, and she wanted to hear the good news he brought.

"Princess, the prince is awake now."

"Yeah." Gu Yunru nodded rapidly. Seeing that Qingfeng's expression today was a little different from the past, she narrowed her beautiful eyes in confusion.

"Qingfeng, what makes you so happy today?" Qingxing asked on behalf of Gu Yunru.

"..." Qingfeng didn't know how to tell the two of them about this.

"Let's go." Seeing that he hadn't been able to fart for a long time, Gu Yunru took Qingxing and rushed to Rong Zhen's room.

Rong Zhen was taking medicinal food at the moment. When he saw Gu Yunru coming, he focused for a moment and asked the servants to leave.

"How is it?" Gu Yunru sat down beside his bed and looked at him with her big black eyes.

"What's going on?" Rong Zhen looked at her and asked a bunch of nonsense words, not knowing how to respond.

Qingxing stood aside and looked at him with a smile and said, "The princess means to ask, Your Majesty, how is your health?" Qingxing could easily see through the emotions of the two. The worry in Gu Yunru's eyes was not fake.

"I feel good and everything is much better." Rong Zhen subconsciously touched his chest, but he didn't know how his back was feeling.

Gu Yunru winked at Qingxing, signaling her to turn around. Qingxing did as she was told without saying anything.

Gu Yunru's big hand reached out to Rong Zhen's shoulder and pulled up his thin shirt. His muscular upper body was exposed to the air, and there was a burn mark on his back.

Seeing this scene, Gu Yunru frowned with some heartache.

"Does it hurt?" Gu Yunru stretched out her slender fingers, but did not dare to touch his back.

"You underestimate me too much. Can't you see how many sword wounds there are on my body?" Rong Zhen pondered for a moment, not wanting the woman in front of him to underestimate him.

"You're just being stubborn." Gu Yunru took out the ointment she carried with her and sat beside him, preparing to apply it on him.

The medicine is quite strong, and it also contains mint and cactus. When applied to the wound, it will cause some discomfort and irritation, but Rong Zhen's expression did not show any reaction, he just gritted his teeth and endured it.

"If it hurts, you can scream out." Gu Yunru gently stroked his wound. She didn't expect that she could say so many words at once.

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"It doesn't hurt." Rong Zhen gritted his teeth and said stubbornly, but the sweat on his forehead betrayed him. He grabbed her arm directly, which made her feel a little painful.

Gu Yunru smiled at him calmly, with a nonchalant expression. After applying the medicine to him, she rebandaged his back for a while and let him lie in her arms.

"If you're tired, take a nap." Gu Yunru brushed the strands of hair on his forehead and found that the sweat was almost sticking to his hair.

Rong Zhen's breathing became a little heavy and he slowly closed his eyes.

Gu Yunru accompanied him to take a nap for a while, and when it got dark, she returned to Ginkgo Garden, wrapped herself in a cloak, and began to design a fire extinguisher.

As we all know, the principle of a fire extinguisher is to cut off the source of fire. Gu Yunru took the brush and drew on the paper, but felt that the effect was not ideal, so he took another piece of paper and drew casually.

"Princess, have some rock sugar and snow pear soup. The doctor said it's good for your throat." Qing Xing saw that it was so late, but the lights in the princess' room were still on. She walked over and put the snow pear soup in the medicine jar aside. She looked at the strange objects in the painting and frowned curiously, "Princess, what is this?"

"You don't understand. This thing is called a fire extinguisher. I saw that when the fire broke out that day, you were all in a panic and just used water to put out the fire. This is wrong and will only make the fire bigger and bigger." Gu Yunru seriously explained the principles of fire extinguishers to Qingxing, and the little girl listened with gusto.

"So this thing is called a fire extinguisher, but it looks really ugly. Princess, what are you going to do with it?"

Gu Yunru touched his chin, pondered for a moment, a gleam of light flashed in his eyes, and he smiled and said, "It's not difficult to make something like this to stop the fire. You can use some flour or something. It's a pity that there is no dry ice in this era."

Hearing the princess uttering some words that did not belong to this era, Qing Xing scratched her head in confusion. Could it be that she was too stupid to understand the meaning of the princess' words? But every time the princess would say some words that she had never heard of before.

"Okay! It's done. I'll have someone prepare the materials tomorrow." Gu Yunru rubbed his hands excitedly, looking at the fire extinguisher he had made. It was completely different from the nozzle fire extinguisher currently in use. He needed an extrusion type part, and the thing he wanted had to be designed by a specialist.