A crown princess who doesn't do infrastructure construction isn't a good doctor.

Seeing Lu Yu reveal a mischievous expression that he would never show in public, Qin Suiyou raised an eyebrow slightly.

"Whom will you marry into?"

Lu Yu glanced towards the study door and then said, "The most beautiful flower in the Northern Region tribe is said to have fallen in love at first sight with the commander of the Northern Qian on the battlefield, and has declared that she will never marry any other man in her life except him."

Qin Suiyou pursed his lips, a smile playing on his lips.

"You've been quite talkative today."

Lu Yu remained noncommittal, poured himself a cup of tea, drank it, and said calmly, "After all, I need to report on the mission, so I have to be detailed. I have to go out in the wind and sun to gather information, and my skin seems to have become a bit rough."

Since the writing and drawing had already been prepared, Qin Suiyou's hands, which were now resting on the table, were empty. After hearing what Lu Yu said, Qin Suiyou turned his right hand over, and a porcelain jar the size of a fist appeared in his hand.

"I gave you the recipe, why don't you make it yourself?"

Lu Yu stepped forward and took the porcelain jar, a slight smile playing on his lips, showing none of the aloofness he displayed in front of Beitang Xinyue and the others.

"I can't let you be idle, and for some reason, the things you make are better than the things I make myself."

With his hands free, Qin Suiyou waved them off.

"Alright, mission report complete. You can go back now."

Lu Yu turned and walked towards the door, then said, "I'm not blind. If I don't leave now, this person might get upset."

As they were talking, Lu Yu opened the door, and there stood Bei Tang Yan, whose height almost reached the door frame. Lu Yu's expression returned to its usual calm, and he walked straight past Bei Tang Yan.

When Beitang Yan entered and sat down next to Qin Suiyou, he saw the smile still lingering on Qin Suiyou's face and asked, "What did you two talk about?"

"You heard everything from outside the door."

Qin Suiyou had noticed Beitang Yan's arrival long ago, but for some reason he didn't come in. Instead, he was eavesdropping outside. He poked Beitang Yan's head and said, "Who did you learn bad habits from? You're eavesdropping now. It's not like I'm not letting you in."

Grabbing Qin Suiyou's hand, Beitang Yan held it in his own and gently kneaded it.

"You're talking, I'm afraid I'll disturb you."

Qin Suiyou didn't pull his hand back either, and Ren Beitangyan played with it like a fluffy toy, laughing, "Truly a child's temperament, always acting strange."

"I'm not a child."

Beitang Yan relentlessly refuted Qin Suiyou's claim that he was young, but this was usually the only thing he would refute Qin Suiyou about.

Immediately afterwards, Beitang Yan added, "I wasn't pretending to be weird."

Qin Suiyou tilted his head to look at Beitang Yan's shifty eyes and said, "He's not pretending. Who is hiding outside the door like a thief and not coming in, saying he's afraid of disturbing you? I didn't say you couldn't listen openly."

Beitang Yan pursed his lips and whispered, "You two are so close, giving each other gifts is a small matter, but who knows what little secrets you might be telling me that you don't want me to know?"

"Ah~ you saw the face cream I gave to Lu Yu."

Beitang Yan nodded.

"Ah."

“We grew up together, so it’s normal for me to make things for him and Lu Xi. You don’t need to think about it so much.”

Hearing that they had grown up together, Beitang Yan felt even more heartbroken, but he just kept his eyes down, his lips stubbornly pursed, and remained silent, looking extremely aggrieved.

Qin Suiyou then withdrew his hand and gently rubbed Beitang Yan's head.

"Hmm... let me think. You basically have everything you need now, and you're probably tired of the candy I gave you before..."

Before Qin Suiyou could finish speaking, Beitang Yan hurriedly interjected, "I'm not tired of it yet!"

"Why are you in such a hurry? But do you still want those candies?"

Beitang Yan hummed in agreement and said, "I like everything my wife gives me, but it's okay if we don't have any more."

That means if there's any more, we should keep giving it to him. Qin Suiyou pondered that he should prepare some new flavors for Beitang Yan.

While pondering, Qin Suiyou looked Beitang Yan up and down. When he saw Beitang Yan's empty waist, he thought of the empty jewelry box in the main room where he had lived for a long time, and his eyes lit up.

"Ayan, didn't your mother buy you any accessories?"

Beitang Yan frowned, thought for a moment, and then shook his head.

"do not know."

Seeing this, Qin Suiyou slowly nodded and said, "That's alright, a little more is fine. You can wait a while. When the Imperial Concubine's birthday banquet is held, it will be time for you to reappear. I will give you some good things then."

Upon hearing this, Beitang Yan's eyes instantly lit up.

"What good stuff?"

"It's a secret for now, I'll tell you later."

After calming Beitang Yan down for now, Qin Suiyou looked at his newly drawn blueprints and said, "What do you think? Should I just buy both shops on either side of the bookstore?"

Beitang Yan said in a clear voice, "Whatever my wife decides is fine."

"Alright, we'll have Jinwen discuss it in a few days."

In the afternoon, Qin Suiyou observed the lab rats used to test the drug on little Beitang Rui, while Beitang Yan looked at "Military Theory," which was still quite advanced for him at the time.

"Honey, do fighter jets really exist, weapons that can fly into the sky and drop bombs?"

Qin Suiyou took notes while answering Beitang Yan's occasional questions.

"Of course! Would you like to try flying a fighter jet?"

Beitang Yan leaped up from the rattan chair and quickly moved to Qin Suiyou's side.

"Wife, wife, where are the fighter jets? I want to fly one!"

Qin Suiyou's gaze remained fixed on the notebook in his hand, occasionally glancing at the white mouse in the cage.

"Not yet, the technology is still in the experimental stage, and if you want to open one, you have to go through the standard inspection and training first, and then obtain the relevant certificates."

Undeterred, Beitang Yan continued excitedly, "When will the technology be ready for testing? How will it be inspected and trained? Where can we take the certification exam?"

"It's not possible in the short term. I'll make arrangements for you when I take you back to Zhongzhou City. Don't worry."

Before Beitang Yan could ask anything else, there was a slightly urgent knocking sound from outside.

Beitang Yan went to open the door, and the person who came in was Du Ruo.

"I need to speak with you, young master."

Beitang Yan stepped aside with a blank face. After Du Ruo went in, she said to Qin Suiyou, "Young Master, Xiao Dong suddenly has a severe toothache. Uncle Ma took him to see Mr. Li. After Mr. Li prescribed painkillers for him, he said he wanted you to take a look at the prescription and wanted to learn about your knowledge in this area."

Qin Suiyou was finishing up his notes, but he still listened attentively to what Du Ruo had to say.

"Go and call Xiaodong and Mr. Li over. I'll be done here soon."

"it is good."