When later historians divided the so-called "Underground Age" into years, there was hardly any controversy about the year in which it ended: 223, but there is much controversy about what led to the end of the "Age".

Some say it was the class antagonism sparked by the so-called "war on the wall" that led directly to the end of the era a year later.

Some people say that the earlier "People's Park Incident" was the origin of everything, attacking the wrong people in the wrong place.

Some people say that it should be traced back to the "Battle of Fu'an", when the above-ground humans first came into contact with the underground humans.

Others say that the military's "Yizhi Project" is the culprit.

But among the many theories, most people support one of the strangest theories:

On February 14, 220, the third city in the capital area: Yuheng City, the seventh orphanage in the northern suburbs. It was here on this day that the fuse of history was lit.

On that day, the heroes of the people and the sinners of history appeared on the stage of history at the same time.

The No. 7 Orphanage is located in the northern suburbs of Yuheng City, on the edge of the central city, and to the north is a large agricultural production area, in addition to growing low-temperature rice for two seasons a year, there are also patches of vegetable production bases. Closer to the central city, you can see several boxy and windowless agricultural buildings that jug into the roof of the cave, which produce some vegetable crops and poultry meat, eggs and milk that are more sensitive to temperature and humidity.

In a city with a huge space like Yuheng, it is extremely difficult to maintain a high temperature and consumes a lot of energy, so although the temperature will be adjusted to match the crops, it will generally be maintained at 15-20 degrees Celsius, and the days above 25 degrees or below 15 degrees in a year add up to only a short month. In this city, it is not a strange way of life to wear long sleeves or dresses all year round.

Food crops such as rice and wheat have almost all been adapted to such temperatures, with two crops a year in large cities such as Yuheng and three crops a year in some small and medium-sized cities that can maintain higher temperatures.

Yuheng covers an area of only about 110 square kilometers, and agricultural land alone accounts for more than half of 60 square kilometers, but despite this, the food self-sufficiency rate barely reaches 67%. A "city" level unit on the scale of Yuheng City needs 8 agricultural towns to provide food aid, and due to the limitations of geological conditions, it is not possible to dig a town-level cave to dig it, which is why there are only 15 "cities" underground.

In the past 20 years, only 2 new agricultural towns have been expanded, so the current population pressure is extremely serious.

A three-storey white building surrounded on both sides by a small river, covering an area of about 400 square meters, has a small playground in front of the building, in addition to some children's sports facilities, and several anti-striking wooden stakes for practicing knife skills, on which several long rubber knives are hung.

This is the No. 7 Orphanage in Yuheng City, where a total of 21 children aged 0-16 were adopted.

On the first floor of the building are classrooms and cafeterias, which are divided into nursery, beginner and advanced classes, and the teachers of the classes are the staff of the orphanage. The orphanage is not only responsible for receiving and raising orphans, but also responsible for basic cultural education.

Nursery is a place where children under the age of 7 learn the basics of writing and language, Beginner teaches children under 14 years old the basics, and Advanced classes teach children under 16 years old future life skills. When the child reaches the age of 16, he or she must leave the orphanage and enter the society to find a job and live on his own.

Although there is no "monetary system", if you want to live, work is still necessary, just like the bad guy who killed Matt in a taxi.

"Teacher Ye, Zhou Nan in your class abducted Yi Ersan and Bai Hua in my class again!" Standing at the door of the intermediate class was the teacher of the senior class: a middle-aged male.

He is slender, slightly thin, and straight. With a long chin and rather prominent front teeth, the two lips can barely cover when not speaking, and the lips are plump and have beautiful curves. Is he old or young? Is it thirty or forty? It's hard to tell.

Then at the door of the senior class classroom opposite, a girl in denim shorts with long hair walked out, and the rounded long legs under the denim shorts showed what is the vitality of youth.

She bowed slightly to the middle-aged teacher and said, "Teacher, I'll go find them." ”

The middle-aged teacher suddenly showed a doting smile: "Pay attention to safety, calm down classmates." ”

He likes to be a good student like calm! It was also his only consolation in the senior class. True, there are currently only three people in the advanced class, two of whom are idiots.

Ahh

Bai Hua and Yi Ersan sneezed at the same time, and the two were squatting in a sweet potato field, guarding two directions.

Bai Hua: "There are no enemies on the left, OVER." ”

Yi 23: "There is no enemy on the right side, OVER." ”

Zhou Nan, whose figure was almost no different from two years later, squatted in the sweet potato vine, dug the ground with a small branch, and then took out a few sweet potatoes from the ground, and then threw them in the direction of Yi Ersan and said: "Big harvest, big harvest." ”

Yi Ersan carried the sweet potatoes in his jacket and said with drooling, "Go to the woods and roast them." ”

Sweet potatoes are a good thing, the daily quota is very small, and you may not be able to eat them once a month, but if you go directly to the field to steal them, it is too unqualified.

Watching calmly walk out of the building, the middle-aged teacher's smile suddenly disappeared, and then his cousin chattered solemnly again: "Yi Ersan and Bai Hua's kind of crane tail is not to mention, even the calm with excellent grades and understanding has run away, if it delays the child's future future, what should I do!" Take care of Zhou Nan in your class! ”

"Yes, yes, when Zhou Nan comes back, I will definitely criticize her."

Unlike the upper grades, in order to get along with the children better, the teachers in the nursery and intermediate classes are gentle women. This female teacher surnamed Ye is very young, and at first glance she looks like a very gentle type, and it can be seen from the beads of sweat on her forehead that she is not very good at facing this wordy middle-aged uncle.

Zhou Nan is half a year younger than Yi Ersan, Calm and Bai Hua, and is still in the intermediate class, while the other three have just entered the advanced class.

This year, they were 14 years old.

Calmly and silently walked out of the building, came to the small playground, and walked towards the field to the west.

The endless green in front of you is refreshing, and even if the sky is false overhead, it is still mesmerizing under the breeze that has been artificially created to promote air circulation.

If you look up slightly, you can see the dense white rectangular houses and green roofs on the cave walls, as well as a large number of cable car transportation systems. For the calmness of the time, it was the edge of the world.

In the middle of the field there was a trail trodden by footsteps, and near hand, although I didn't see it, there was a clear slow stream, and there were small carp swimming in the pools under the trees.

It was a drainage ditch for irrigation and drainage, which stretched straight ahead, into a field of low trees. A pond for irrigation and storage is surrounded by low trees with drooping branches, and a grove of tall camphor trees grows on the south side of the pond. The slender branches swayed gently in the breeze, and the clusters of leaves trembled slightly, like a girl's hair.

In the fields, this type of tree is only found around the pond, and the tree serves as a clear signpost to prevent machinery working nearby from falling into the pond due to careless operation.

Calm doesn't know the name of the tree, but every time I see that kind of tree, I get in a good mood.

She silently walked into the woods, where the four of them were secretly based, and as she expected, Zhou Nan and Bai Hua were squatting under the tree, using dead leaves and dead branches to stew sweet potatoes.

It was a well-designed stove, and in order to prevent the smoke from revealing their location, they dug a deep pit in the ground, and the smoke exhaust channel was buried in the ground, leading to the stream that joined the pond next to it. The water was constantly bubbling and a large amount of black ash gushing out, and the residual cooking smoke was almost negligible, and after being blocked by the dense camphor branches and leaves on the upper layer, there was no cooking smoke visible above the trees.

In order to eat, I really used all my ingenuity.

"Oh, quietly, you're finally here." Zhou Nan smiled, "Thanks to you for dragging that annoying old man." ”

"Where's Yi Ersan?" Calmly asked.

"I fell when I came here with sweet potatoes before, and I was fishing in the drainage ditch." Zhou Nan said speechlessly, "His flat throwing skills are simply stupid and crying." ”

Bai Hua said good things for Yi Ersan: "It's Nannan's fault for you, knowing that Xiao Yi has no motor cells, you still let him take so much." ”

"I don't want to save more so I can eat it slowly in the future." Zhou Nan muttered, the small branch in his hand brushed aside the homemade adobe brick blocking the stove, grabbed a handful of small branches and threw it on the fire, and then blocked the stove with the adobe brick.

At this time, the gray-faced Yi Ersan came back with a few sweet potatoes, his shoes and trouser legs were wet, and it seemed that he was quite lucky to go into the drainage ditch to catch sweet potatoes.

At this time, Yi Ersan looks quite cowardly, and he doesn't have the casual and calm appearance that he had two years later, although he still has curly hair, but if he doesn't say it, ordinary people will even think that they are two people who look alike.

Bai Hua jumped forward, grabbed a branch and rotated it one hundred and eighty degrees, and then stood on top of the branch. Then Yi Ersan handed the sweet potatoes to Bai Hua one by one, and Bai Hua hid the sweet potatoes on the branches above. Since there are no birds, insects, and all other non-human animals in Yuheng City, there is no need to worry about sweet potatoes being stolen and eaten.

These guys really do everything they can to eat.

Or rather, no one can resist the temptation of roasted sweet potatoes, and even the calmness of the fragrance of starch when it is heated and converted into sugar makes even the coolness drool.

However, sweet potatoes are delicious, but they are easy to leave the smell of charcoal and sweet potatoes on their clothes.

Calm took off his shirt and denim shorts and threw them to hang on a tree, and then threw two pieces of underwear on the branches. Her body was fair and smooth, and with this elegant, uncaring gesture, she seemed to wipe out the entire human culture.

If you take off and eat sweet potatoes, you can do it calmly.

"Oh." Just like taking off his clothes calmly and without avoiding, Yi Ersan also watched calmly undressing without evasion, and then his eyes were covered by Zhou Nan.

"Look at what, look!" Zhou Nan turned to Bai Hua who was pretending to cover his eyes but peeked through his fingers, "You too!" ”

Then there was a wonderful scene, Bai Hua and Yi Ersan lowered their heads and munched on hot sweet potatoes, Zhou Nan encountered a lot of difficulties because he was afraid of being hot, and calmly sat on the branch and slowly enjoyed the rare good things.

At that time, I was as calm as I am now, and I could synthesize serious things with a group with facial expressions, or I could do funny things without common sense. Aside from her height and hair length, she has barely changed in the past two years.