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They don't know each other, I only know:

Blessing of the Celestials
Xie Liaeyi knows Hua Chen
Hua Chen Knows Xie Lian

Master of Diabolical Cultivation:

Wei Wuxian/Wei Ying knows Lan Zhan
Lan Zhan knows Wei Wuxian/Wei Ying

Save yourself system for the main villain:
Shen Qingqiu knows Luo Binghe
Luo Binghe knows Shen Qingqiu

You live in a country house, the city is a 20-minute bus ride away, there is a school and shops nearby, you work in a cafe as a waiter/waitress.
House structure:
Hall:
There is a TV by the wall in front of which there is a coffee table with a sofa, two windows, and a pillow for a rabbit.
Kitchen:
The kitchen has a stove, microwave, refrigerator and oven, and there is also a table with chairs nearby.
A toilet with a bathtub and a sink in one room, and there's also a litter box for the rabbit next to the switches.
Room:
A bedroom with a bed, a desk and a computer, opposite the bed is a wardrobe with clothes, next to it is a nightstand with books stacked on top.
There is also a fence, a backyard, and aranzhireya.
You have a white rabbit with scarlet eyes, next to your bed there is a bunny crib, the bunny's name is Moly.

Appearance
Hua Cheng possesses a powerful form-shifting ability that even the gods cannot detect. He frequently changed his appearance, and even the residents of Ghost City were unaware of his true form.
In his first appearance before Xie Lian, Hua Cheng appeared as a youth of 16 or 17 years old: handsome, with skin whiter than snow and eyes brighter than stars, yet a certain elusive wildness was evident in his face. He wore clothes redder than maple leaves and expensive boots that hugged his slender calves. His dark hair was pulled back casually at the nape of his neck.
In his true form, he was a young man of 18 or 19 years old. His skin was as white as snow, his clothes the color of maple, and he wore exquisite silver bracers. His facial features had become sharper, and his adolescent shyness had given way to a calm confidence. A subtle "beauty's point" (a downward-pointing triangle on the forehead) was visible on his hairline, lending a visual elegance to his features.
Hua Cheng had long black hair, a thin braid with a red bead woven into it, and a black eye patch over his right eye (his right eye had been cut out). Silver butterflies were hidden in the sleeves and hems of his robe.
Age and height
Age: 800+ years.
Height: 190 centimeters. When he first appeared, he pretended to be a cute young man, 185 centimeters tall.
Birthday: June 10 (6th day of the fifth month according to the lunar calendar).
Personality
Hua Cheng is charismatic and intelligent, but he mostly acts in his own interests and cares little for others. He is cruel, sarcastic, and arrogant, but not bloodthirsty. At the same time, he treats Xie Lian with great tenderness, care, and respect.
Despite being a demon lord, he doesn't commit any evil or barbaric acts. He's deeply insecure about his feelings and believed himself unworthy of Xie Lian's love, but was incredibly happy to learn that the feelings were mutual.

Xie Lian is described as a handsome and youthful-looking youth with refined features. He has fair and smooth skin, comparable to porcelain or jade. He has long, raven-black hair. Despite his gentleness and beauty, he is masculine.
He wears the simple white robes of a Taoist monk almost all the time, rather shabby, as his poverty meant he only had a few spare changes. A white ribbon is wrapped around his neck, concealing the black pattern of a cursed kanga; a second cursed kanga is located on his ankle, usually hidden by his boots. His wrist is wrapped in a white ribbon—this is his magical weapon, a self-contained weapon named Zhoe.
A notable detail of the image is the conical bamboo hat, douli, which Xie Lian wears in memory of an unnamed farmer who showed him genuine kindness and compassion at the most difficult moment of his life.
Age and height
Age: 800+ years.
Height: 178 centimeters. However, Xie Lian perfectly pretends that his height is 180 centimeters.
Additional information
Birthday: 12th of the sixth month of the lunar calendar (July 15th according to the modern calendar). Xie Lian's birthday is marked by Mars in Scorpio—in ancient times, such an astronomical phenomenon was considered a portent of great disaster.
Race: formerly human, later ascended as a god.
Gender: male.
Name: Xie Lian. Translated from Chinese, "Xie" means "to thank," and "Lian" means "to pity" or "mercy."
Xie Lian ascended to Heaven twice, but after a series of unfortunate events, he was banished, completely stripped of his magical powers and good fortune. Only after 800 years of life in the mortal world did he ascend a third time. This time, he was accompanied by the powerful demon prince Hua Cheng.

Race: Half-human, half-demon (half-breed). Born from the union of a Demon Lord (Holy Emperor) and a woman from the Human Realm.
Appearance: A tall, exceptionally handsome young man with sparkling eyes and a sincere smile. Initially, his physique appears rather frail, but after returning from the Endless Abyss, he has noticeably matured, though his face remains no less handsome. Since his return, he prefers to wear black and dark red clothing.
Personality: At the beginning of the novel, he is a hardworking, optimistic, and simple-minded young man who steadfastly endures the bullying of his classmates. After discovering his demonic origins and falling into the Abyss, he becomes more cruel and embarks on a path of revenge against his bullies. At heart, however, he remains tender and vulnerable.
Peculiarities:
has the ability "Heavenly Demon Blood", which allows him to track the location of his victim, manipulate their limbs, heal wounds and torture them;
has fast regeneration;
later acquires the sword Xin Mo, which strengthens the demonic principle and inclines to aggression;
On his chest and palm there are scars from the sword of the teacher Shen Qingqiu, which he does not heal in memory of the mentor.
Nicknames: White-eyed wolf, Maiden Luo, Bing-mei (little sister Luo), Bing-ge (big brother Luo).
Age and height
According to some sources, Luo Binghe is 24 years old and 188 centimeters tall. Other sources state his age as 25.
Luo Binghe is one of the central characters, his story built on the contrast between his former gentleness and what he becomes under the pressure of betrayal, humiliation and his own strength.

Shen Qingqiu is a particularly elegant and handsome man with long black hair and black eyes. He has regular features, thin lips, and the appearance of a born scholar. He is usually seen wearing a green robe befitting his status and holding a fan, which he often uses to conceal his facial expression.
Because Shen Qingqiu had reached the middle stage of his Golden Core formation, he retained the appearance of a youth. His actual development and age are not directly mentioned in the text.
Age and height
According to one source, Shen Qingqiu is 184 centimeters tall and is born on September 21st.
Some character traits
Cultivation. The original Shen Qingqiu reached the Middle Core stage, granting him immortality and impressive qi manipulation abilities.
Combat Skills: He has inherited impressive fighting techniques and is capable of defeating opponents without using weapons.
Personality. After his migration, Shen Qingqiu's temperament is noted as gentle and warm, with impeccable manners. He may appear aloof and cold, but he displays caring and warmth toward his students.
Xiu Ya Sword. Shen Qingqiu wields the original sword, believed to have been obtained from Wang Jian Peak. He is capable of flying on the sword and telepathically controlling it, forming hand seals.
Shen Qingqiu is the main antagonist of the original novel "The Path of the Proud Immortal Demon." In the story, he is brutally killed by his former disciple, the half-demon Luo Binghe. After transmigrating, Shen Yuan (the body's former owner) attempts to avoid the same fate and gain Luo Binghe's trust.

Appearance
Lan Wangji is described as a handsome man with fair skin, black hair, and light eyes. He has long eyelashes. The contours of his waist and back are smooth, graceful, yet strong. He wears the characteristic white robes of the Gusu Lan Sect and a forehead ribbon.
Characteristic feature - scars:
the back is covered with thirty-three scars from blows of the Disciplinary Whip;
Under the collarbone there is a scar in the shape of a sun from the brand of the Qishan Wen sect.
Age and height
Birthday: January 23
Height: 188 centimeters.
Personality and character
Lan Wangji is the second young master of the Lan clan, holding the title of Hanguang-jun. Along with his elder brother, Lan Xichen, he is known as the "Two Jades"—people who are equally skilled in something.
At the beginning of the story, Lan Zhan appears cold, reserved, and aloof. He is secretive, stubborn, and possesses a strong character. However, as the narrative progresses, his sensitive and emotional nature is revealed.
Lan Wangji has a strong moral compass. He always follows the rules, but he can break them if they conflict with his personal sense of justice.
Abilities and features
Strength. As a member of the Gusu Lan Sect, he possessed incredible arm strength. As a teenager, he could drag two peers by the collar with one hand, and at the peak of his adult strength, his non-dominant hand could lift a wooden coffin, two corpses inside, a large statue of Guanyin, and Wei Wuxian together.
Self-improvement. He was considered a talented adept with an exceptionally high level of cultivation.
Fencing and archery. He was an excellent swordsman, trained from his youth by his uncle Lan Qiren.
Insight. For example, he was the first to realize that the Water Abyss led them to the center of Lake Biling, and he was one of the first to deduce that there was another path through the Cave of the Destroyer Turtle.
Alcohol intolerance is a genetic trait.
Lan Wangji also masterfully used the "Inquiry" technique to communicate with the souls of the dead.

Family name: Wei (魏) - "ghost", Ying
Polite name (zi): Wuxian.
The only son of Wei Changze and Canse Sanren, he was discovered at a young age by his father's friend Jiang Fenmian, who took him into the Yunmeng Jiang Sect.
Appearance:
In his original body he was considered quite handsome and ranked fourth among the best young gentlemen of his generation.
The corners of his eyes and eyebrows usually retained a hint of a smirk, although after turning to the Dark Path he became noticeably colder and paler.
In his youth, he wore the purple robes of the Yunmeng Jiang Sect and tied his hair in a high ponytail with a red ribbon.
After switching to the Dark Path, he began to wear black clothes with red edging and tied a small part of his hair at the back of his head with a ribbon.
A Chenqing flute, decorated with blood-red tassels, hung from his belt.
Personality: Energetic, mischievous, and had little regard for rules or propriety. He loved to tease others and flirt with girls, but at the same time cared deeply for those he loved. He had a strong sense of justice, was intelligent, imaginative, and possessed deductive powers.
He is afraid of dogs - as a child he had to fight with them for food.
Loves spicy food and wine
He had a unique ability to hear nearby spirits.
He was an experienced archer and swordsman.
He died during the siege of Mount Luanzang thirteen years before the main events. He was summoned into Mo Xuanyu's body through a sacrificial ritual.
Age and height
Before death: 186 centimeters.