MTL - Is the End Really Coming? - ~ ask for help

The technology fanatic Huo Tian from the future world died because of a research accident and transmigrated into the body of a fake rich daughter from a wealthy family.

Before the real daughter of the family came back, she was the treasure of the family, and everyone treated her like a princess. After the real daughter returned, her status plummeted, and they treated her as an outsider.

Living in a wealthy family that valued blood relations the most, Huo Tian, an unrelated outsider, was given a hard time. Everyone hated and despised her. Leaving behind a letter of severance, Huo Tian left the Huo Family on her own accord without any lingering reluctance for her once luxurious life.

She started a new life with the original Huo Tian’s biological mother and uncle, who had been abandoned by the Huo Family’s real rich daughter. She started a business from scratch.

With her understanding of the future world and her grasp of futuristic technology, Huo Tian quickly became famous in the business circle and established a research company that was renowned throughout the country. All the researches from her company were ten years more advanced than everywhere else in the world. With every research published, the whole world would be taken aback and impressed by how miraculous it was.

As time passed, Huo Tian became increasingly successful. Just as she was getting used to being called a fake rich daughter, the secret that her biological mother hid was out of the bag—Huo Tian’s biological father was the head of the noblest and the most powerful wealthy family at an international level, the Xi Family.

Compared to the Xi Family, the Huo Family was nothing but insignificant. The fake rich daughter in everyone’s eyes and the joke among the wealthy circle suddenly became a real rich daughter of the most influential family. Moreover, the head of the Xi Family seemed to be spoiling his long-lost daughter to the heavens...

Leon is an average high school student who likes to watch anime and read novels.
He's about to cross the street, only to be greeted by a truck and died.
But, he got reincarnated as Uchiha yet dead again because Itachi killed him.
Leon got reincarnated again as the grandson of the recovery girl.
He got kidnaped and tortured by All For One.
After his third death, he got reincarnated as a son of Bibi Dong.
In this fourth life, he wants to change his fate to become the strongest.

Note: Please read the tag before reading.
- English is not my first language, so there would be grammatical mistakes in this story.
- Please give my story a proper review.
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This is a story about the protagonist getting the system, going crazy in the biochemical apocalypse, producing aircraft and tanks, destroying zombies, saving good people and killing bad people.

- Description from novelbuddy

Song Yan lived a miserable life. She was born with a great fortune but her ‘ luck ‘ was ‘ snatched ‘ by her half sister . It was her fortune that she was fated to marry Fu Yusheng , the Ceo and owner of the Fu corporations . However , her half sister who was jealous of intercepted in her fate and snatched her ‘ good luck ‘ away , from then on Song Yan faced countless troubles , she met with accidents , lost her scripts and finally died after meeting a road accident .

But she was unwilling , unwilling because she loved Fu Yusheng and her son whom she left behind in the Fu family . Her soul that should have scattered and brought to Hell in front of King Yama , turned into a vicious ghost .

Only after becoming a ghost did she realise what kind of perfect deception her half sister has planned for her .

Luckily before her soul could become any more dark and become a malevolent spirit , she crosses path with a Celestial master who promises her a fresh start as long as she stays with him and learns the way of supernatural . So , Song Yan became the Celestial master’s disciple and continued to serve the Celestial master and his family as a Ghost .

After five hundred years of service , she is freed by her master and get a chance to rebirth .

She is reborn on the day she met with the car accident .

In this life she is endowed with supernatural power to see the celestial truths .

She vows to avenge herself and her son who met an unfortunate death because of her half sister .

But why is her apathetic husband who never cared about her , coming after her ?