The Extra becomes the Villain's Bodyguard - Chapter 43: Research part 1.

Shen Yinning was originally the Crown Prince Lu Ying's childhood sweetheart and fiancée, but due to her father and brother's rebellion, she was exiled to Gan State and married to a minor local official as the daughter of a criminal. Meanwhile, Lu Ying gloriously married her cousin Shen Yunxi as his Crown Princess Consort.Three years later, Shen Yinning returned to the Capital with her husband. Everyone praised the Crown Prince and Princess for their mutual respect and harmony, and Shen Yunxi often flaunted in front of her how loving she and the Crown Prince were. However, only Shen Yinning knew that the seemingly restrained and honorable Lu Ying came to her chamber every night, completely disregarding the fact that she was now someone else's wife, secretly claiming her and keeping her as his Forbidden Fruit...

Back in 1991, in the face of this golden age, Chen Jianghai swears that he will only live in three words in this life: Lin Wanqiu! The story of a reborn person who built an electrical empire and reached the pinnacle of his life!

- Description from novelbuddy

In this post-apocalyptic world filled with beasts, humans must join together with their newly acquired classes to battle them. However, beasts aren't the only thing threatening the peace as class users similar to those around Kaden make moves in the shadows. Join Kaden in his adventure as a class user uncovering the dark secrets of those around him whether he wants to or not and paving his way through this treacherous world.

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Li Yun transmigrated into a cultivation world with one thing others could never possess.An EXP System.Every mission grants experience. Every kill sharpens his strength. Every life-and-death battle rewards him with techniques, comprehension, and instant breakthroughs.While cultivators struggle for years to advance a single realm, Li Yun grows stronger by completing tasks the world throws at him.Sect missions become stepping stones.Geniuses become experience points.Heaven itself becomes an obstacle to grind through.When cultivation laws fail to contain him, Li Yun does not submit.He levels up.This is the story of someone who is leveling up invincibly in the cultivation world.