MTL - From the Dungeon, Slaughter the Demon Apostle - Chapter 4 practice?

Cultivating his power by slaying demons and taming countless beasts, the emperor solidified his throne as the world's ruler. But not once in his life had he expected that his disciples would use research on demonology to sap the world tree's power and push the world to destruction.Trying to fix his mistake, he opted to use all of his cultivated power to cure the world tree and block anyone from sapping its power ever again. But in exchange, he was to lose all of his power.But...the worst had happened, his wife... had betrayed him.

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.
- I accept a suggestion, but no spam!

Jianjing was reborn into a parallel world and became a genius novelist.Or rather, the soon-to-be deceased young genius novelist…[System Warning]: You committed su*cide, estimated time of death in 10 minutes.[Mandatory Mission]: Escape from the enclosed room.[Reward and Punishment]: Successful escape means the author continues the story, failure means the story is abandoned.Jianjing: WTF?!System: This is just the beginning, face the storm ahead!Jianjing’s view of herself: An ordinary bestselling novelist.Others’ view of her: “Novelist Detective”, “Honorable Citizen for Bravery and Justice”, “Police Consultant”, “Surprise Guest for Horror House Shows”, “Human Representative Against Unknown Creatures”…

Ruan Jiu Jiu transmigrated into a rebirth novel, in which the female lead in her past life had an unattainable love, a white moonlight. In the novel, the white moonlight Cheng Jun was a hollow character with a pretty face but zero accomplishments, and with his cold personality was like a frigid beauty; an empty flower vase. Meanwhile, Ruan Jiu Jiu transmigrated into Cheng Jun’s ex-wife, an evil, stuck-up, female side character.

When Ruan Jiu Jiu transmigrated over, a divorce agreement was placed on the table. Cheng Jun, wet from the rain, ate a bowl of unhealthy instant noodles. Seeing that beautiful, emotionless face, Ruan Jiu Jiu suddenly couldn’t take it anymore and said that she’d wait until tomorrow to reconsider the divorce.

Later.

Ruan Jiu Jiu: Who said that he’s an idiot? Who said that he’s frigid? You’re trolling (╯‵□′)╯︵┻━┻

Actually, this is a relaxed, funny, brain dead, sweet little novel.

Able to be coaxed but can’t be forced female lead X A weak, helpless, intimidating but oblivious Big Boss.

*Has some stuff about video games, if you don’t like that then skip this

1. 100% fluff

2. Expands on a completed quick transmigration novel ~The beginning matches up a bit with that universe~

3. This novel’s ML is a bit weird because he doesn’t have a sense of self-preservation →_→