Raidorl Seiken Senki - Chapter 40: The Demon God of Mischief.

When Qin Yan was five years old, she left the capital with her mother and went to the Pingxi Army under the command of her grandfather, Duke of Zhenguo, in the Northwest. When she returned twelve years later, things were different.

After the mother was attacked and disappeared, everyone in the Prime Minister Mansion only knew of Concubine Song, but not her mother, the honorable mistress. They only knew that there was only one Miss Nian in the mansion, and they did not know that there was also her, the only eldest young lady of the first wife.

The concubine took over her mother’s dowry and pretended to be rich and generous to win people’s hearts. The concubine-born younger sister, with the identity that belongs to Qin Yan, was mixed up like a fish in water in the circle of noble daughters in the capital, and she also intended to get involved with Qin Yan’s fiancé.

The people in Prime Minister Mansion thought that Qin Yan could only be at their mercy when she returned to the capital alone. However, they never thought that within a few days of returning to the capital, Qin Yan was granted the title of Princess of Zhaoren by the emperor and given a palace as the Princess Mansion.

When Qin Yan took back the dowry that belonged to her mother, only then did her father Prime Minister Qin and Concubine Song knew that Qin Yan was the owner of Yu Qingfeng, the first bank in Great Xia.

The City Master of Gu City, an important town outside the Northwest Pass, was known as the owner of Yu Qingfeng, the first bank in Great Xia which claimed to be able to reach half the national treasury.

How many secrets have not been uncovered on Qin Yan?

- Description from Novelupdates

Gu Jin crossed into a novel as the supporting character and best friend of the main female lead, Cheng Xin.

Cheng Xin was frequently surrounded by men of status and quality. As Gu Jin was the female lead’s dearest friend, she doesn’t mind settling for the leftover meager soup if the female lead chose to eat the meat. The two sisters believed they’d enjoy this friendship for a lifetime.

But just as she was ready to latch firmly unto Cheng Xin’s golden thigh, she discovered the body she crossed into had memories of future events beyond the novel’s plot, finding out that her marriage would end in utter failure.

The female lead, Cheng Xin who often quarrelled with the male protagonist would head over to Shao Chong for comfort even though Shao Chong was married to Gu Jin. And after several incidences, Gu Jin advised Shao Chong to have a sense of propriety as her spouse but he told her not to think too much about it, claiming that he only maintained a pure friendship with Cheng Xin.

On the day Gu Jin was kidnapped, her good husband stayed by her cousin’s side and accompanied her to the hospital.

When Gu Jin transmigrated into this new world and learned of the truth, she did not wish to waste this new life as a supporting role for her cousin as the previous soul had done. She’d not live a life as a spectator in someone else’s love story. No. She would be the protagonist of her own romance in this new life.

- Description from Novelupdates

This is the story of a crazy lich who possesses an internal game system and brings catastrophe to the entire world.