I Secretly Develop Myself In The Demon World - Chapter 13 - Changes in Reality

A man who was once called the world’s strongest agent ended up becoming a teacher after his retirement, to train a new generation of agents. After many years of training his disciples, he was killed at the age of 60 by a secret organization’s ruse and was reincarnated in another world with his memories intact. Though he was surprised by the existence of magic and the strange species in that world, he quickly adapted to his condition as a newborn and took advantage of it. He acquired special magic and gained a massive amount of strength thanks to his rigorous discipline, in order to reach his goal: Resume his career as a teacher which he left halfway through in his previous life. This is the story of a man, who, based on the memories and the experiences of his previous life, became a teacher who travels through the world with his students.

Luo Qing Chen is a wandering spirit that died thirty thousand years ago, roaming the Chaos Space

In order to not turn into dust, she is bound by an ice cold system to travel through time and space to complete missions.

Girls that pretend to be weak?  Slap them without explaining.

A silly cannon fodder?  Helping them amass treasures.

Meeting a real male god?  All of them will pamper.

System: Dear masters, what do I do if my host even dares bully the heavens?  Waiting for an answer, it’s urgent!

A certain male god: Change systems.

System: ヽ〔?Д?〕丿

- Description from Novelupdates

Tang Nuan, the cannon fodder supporting female in a sweet pampering novel, woke up after an accident and decided to get rid of her fate after she foresaw her tragic future in advance. The first thing she did was to break off the engagement with her wealthy fiancé. She felt that she knew the plot in advance and also knew the secret of her fiancé Ye Shuyan’s mind-reading ability, so she would be able to quit the marriage smoothly. However, she did not expect Ye Shuyan’s mind-reading ability limited to a three-meter distance would be an exception to her.

Ye Shuyan, who has always been with Tang Nuan out of responsibility, found that his fiancée was completely different from what he imagined after he had the mind-reading skills. He developed a feeling of admiration, so he, who firmly did not want to break off the engagement, and Tang Nuan started a series of battles of wits and courage.

The two protagonists redeemed each other in the struggle between breaking off and not breaking off the engagement, facing their feelings sincerely, and reaping sweet love and marriage.

- Description from Novelupdates

Extras die every day in various ways in the game [Yo-Ma Great War 3].