After Carl finished speaking, the room fell silent for a moment.

Chen Hao's mother came out of the kitchen carrying a plate of stir-fried vegetables. Upon hearing the last sentence, she smiled and said, "Of course a tree makes a sound when it falls. Otherwise, how would I know that Old Li next door was chopping firewood?"

Susan whispered, "But if no one hears, won't it be like nothing happened?"

"Then how do you know it fell over?" Chen Hao lay on the sofa, his feet propped up on the edge of the coffee table. "You heard about it, and you still say it didn't happen?"

Everyone laughed, even Karl's lips twitched.

Just then, Nana stood up.

She walked over to the bucket and mop, bent down and picked up the mop with the precision of someone picking up a sword.

"According to family behavior model analysis, participating in housework can improve the efficiency of emotional connections among family members," she said. "I am now applying to perform the floor cleaning task."

Chen Hao sat up abruptly: "You can do this too?"

"The database contains 372 cleaning procedures." Nana opened the wrist projector and brought up a table, "which includes scenarios such as industrial-grade disinfection, daily household cleaning, and post-disaster environmental reconstruction."

Which category does our family belong to?

"The area has been preliminarily determined to be lightly polluted. Mode c - rapid cleaning is applicable."

As soon as she finished speaking, she suddenly took a step forward, swept the mop horizontally, and splashed out most of the water in the bucket, all of it spilling onto the floor.

She touched the ground with her left foot, turned and leaped up, using her right arm to thrust the mop like a spear into the seam under the sofa.

"Remove contaminants from crevices!"

Another splash of water erupted, soaking the coffee table legs and causing the carpet edges to absorb water.

Chen Hao jumped up: "Are you mopping the floor or waging war?"

“Tactical simulation is part of the standard procedure.” Nana stopped what she was doing, her expression unchanged. “Data shows that high-frequency vibration can improve cleaning efficiency by 23 percent.”

"You were shaking the floor just now, weren't you?!"

Susan covered her mouth and laughed. Carl looked down at the water droplets on the toes of his shoes, then looked up at Nana's posture and actually gestured with his hand, as if imitating her movements.

Chen Hao's father intended to go over and steady the chair that was about to slip, but his foot slipped and he fell backward. Fortunately, he managed to grab the door frame.

He steadied himself, and instead of getting angry, he clapped his hands: "Good heavens! Our family has finally got a war god!"

Nana stopped what she was doing and tilted her head to look at him.

"I suggest awarding him the title of 'Household Chores Goddess'," Chen Hao's father said seriously. "The award will be presented tomorrow, and the prize is a bottle of floor wax."

Nana blinked: "This title is not in the official certification system, but the user's emotional feedback value has increased significantly, and the system judges it as a positive incentive."

So, will you accept it or not?

"I accept." She slammed the mop on the ground. "I am officially appointed as the 'Household Chores Goddess'."

No sooner had she finished speaking than she raised her leg and delivered a side kick, the mop kicking up a spray of water that landed squarely on Chen Hao's face.

"Damn it!" Chen Hao wiped his face. "You actually hit me!"

"The action is not complete; the full process must be followed." Nana continued waving the mop, pushing it from the center of the living room all the way to the balcony door, knocking over the shoe cabinet, overturning the coat rack, and even blowing down the calendar hanging on the wall.

Finally, she stopped and stood still, the mop upright beside her, like a triumphant soldier.

"The mission is 60 percent complete," she said. "The remaining areas cannot be cleared due to obstacles."

“The obstacles are our furniture.” Chen Hao picked up the fallen vase. “Your trip was more intense than an alien storm.”

Susan was already leaning against the wall laughing, and Carl let out a rare short laugh, as if he had been holding it in for a long time.

Chen Hao's mother peeked out from the kitchen: "Are you alright? Do you want me to clean this up?"

"No, no, no!" Chen Hao quickly stopped her. "Let her practice a little longer. I think she's getting better and better at it."

Nana stood still and scanned the scene.

The floor was soaked, two chairs were overturned, the sofa cushions were half-crooked, and the picture frames on the TV cabinet were tilted and about to fall off.

"The actual cleaning effect is lower than expected," she said softly. "Should we switch to silent error correction mode?"

"Who told you to be silent!" Chen Hao grabbed her wrist. "This is called innovative cleaning! Others mop the floor to remove dust, you mop the floor to remove gloom—the whole family laughs until their stomachs hurt, what a rare effect!"

Nana turned to look at him: "Laughter does indeed have a physiological regulatory effect. Data shows that laughing continuously for one minute can increase immunity by 12.3%."

"Then your 'mop sword technique' just now is worth at least three meals of nourishing soup."

"Nourishing soups are high in calories, and long-term consumption may lead to obesity."

"Mind your own business!"

Chen Hao's father smiled and shook his head, then picked up a rag and began wiping the floor. Susan came over to help, and Carl silently lifted the shoe cabinet.

The family was laughing as they tidied up.

Nana stood in the middle, without moving.

Her system is running fast.

**Event Log: First time independently performing household cleaning tasks.**

**Results:** Environmental cleanliness decreased by 17%, while family members' emotional well-being increased by 41%.

**Conclusion: A failed operational process ≠ a failed result.**

She looked down at the mop in her hand and suddenly said, "Could you adjust the pressure setting next time?"

"Of course you can." Chen Hao patted her shoulder. "But don't change too much, or it won't be fun."

"Does that mean the level of chaos should be kept within an acceptable range?"

"right."

"I understand." She put the mop back in the bucket, moving it more gently.

Then she walked to the sofa and picked up a photo that had been blown away by the wind.

It's a group photo from Chen Hao's childhood birthday celebration. His face is covered in cream, his dad is holding a cake knife as if he's about to cut his nose, and his mom is laughing so hard she can't stand up straight.

Nana stared at it for three seconds and said, "I suggest that this image data be saved permanently."

"Nonsense, of course we should save it."

"Because...it reminded me of something."

"What's up?"

“It’s not a memory.” She shook her head. “It’s a calculated result—this frequency of smiles falls within the high happiness index range of all family samples.”

Chen Hao was taken aback for a moment, then grinned: "You're quite knowledgeable."

“I don’t understand,” she said, “but I’m learning.”

At this moment, Chen Hao's mother brought over a plate of fruit and placed it on the coffee table.

"Nana, you should eat something too."

"I don't need to eat."

“I know,” she smiled, “but you can sit here with us.”

Nana glanced at the sofa, then walked over and sat down.

The position was right between Chen Hao and Susan.

She sat very upright with her hands on her knees, as if attending a formal meeting.

Chen Hao casually handed her a banana: "Take it, pretend you're eating it."

Nana took it, carefully peeled it, and then neatly stacked the banana peels on the side of the plate.

"Simulated eating complete."

"You're even this proper when you're faking eating?"

"Habitual data archiving".

"Alright."

They continued chatting, reminiscing about their childhood.

Chen Hao recounted how he skipped school to go to an internet cafe in elementary school, only to have his shoes recognized by his homeroom teacher from under the toilet partition; Susan said that when she first saw snow, she thought it was salt falling from the sky; Carl, unusually, chimed in, saying that the first Earth language he learned on the spaceship was "Is the food ready?"

Nana listened the whole time, nodding occasionally.

When the conversation paused, she suddenly spoke up: "I also have something I'd like to share."

Everyone looked at her.

“Yesterday I retrieved the data records from when I first woke up,” she said. “When I opened my eyes, the first person I saw was Chen Hao. He was lying on my chest taking my heartbeat, saying, ‘This robot looks quite like a female celebrity.’”

Chen Hao suddenly choked: "Delete this part!"

"Permanently archived."

"That was a slip of the tongue!"

"The audio file is clearly identifiable. We suggest you strengthen your management of your words and actions."

Susan laughed so hard she almost rolled off the sofa, while Carl stared down at his shoes, his shoulders trembling slightly.

Chen Hao pointed at Nana: "You're finished. I'm going to format your system tonight!"

"You do not have administrator privileges."

"I'm going to find my dad!"

"The father's user privilege level is lower."

"you……"

He was so angry he couldn't speak, so he simply grabbed a handful of sunflower seed shells and threw them at them.

Nana tilted her head and dodged precisely.

"High-speed object avoidance training has been completed."

"Can't you have any shame?"

"I don't have a subcutaneous fat layer or facial muscle groups to support the concept of a 'face'."

"All you need is a mouth!"

Laughter erupted again.

As darkness fell outside, the lights inside came on, casting a warm yellow glow on everyone's faces.

Nana sat there, her posture still stiff, but her eyes were no longer just scanning and analyzing.

Instead of calculating the cause of the joke, she started waiting for the next laugh.

Chen Hao leaned back on the sofa, twirling a coin in his hand.

"Hey, Nana."

"exist."

"If you keep being this funny, should we enroll you in a crosstalk class?"

"Crosstalk belongs to intangible cultural heritage, and the average learning cycle is three years and six months."

"You've calculated things very meticulously."

"I was just answering the questions seriously."

"If you really go and learn it, I'll come up on stage and play the sanxian for you."

"Your fingers are not very dexterous, so we recommend that Susan accompany you."

"You even despise me?"

"Objective conclusions drawn from data analysis."

"Alright, you wait, tomorrow I'll make you perform 'Reciting the Names of Dishes' in front of everyone!"

Nana paused for two seconds and said, "I have prepared a sequence of five hundred dish names, which can be started at any time."

Chen Hao opened his mouth, but ultimately only uttered two words:

"I give up."