She's a Passerby, But Can See the Protagonist's Halo - Chapter 2

Forced to face how vast and dangerous the universe really is, Desmond decides to seize the opportunity to gain the power he needs to protect what he loves, for his own world is far from safe. Traveling through various worlds, Desmond gathers treasures and powers, gradually discovering the dark secrets that lie behind the false tranquility.

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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

She is one of the best thieves that the world has seen in the 24th century. However, not even in her wildest dreams had she imagine that she’d be reincarnated as a good-for-nothing orphaned Seventh Miss of the Vermilion Bird Family. She finds herself stuck in a family that mistreats her, as well as an unfamiliar place with no support system.

The unparalleled Demon King Ye Xuan, who was able to heal the death or the living alike and holder of the medicine Holy Scripture, was betrayed and killed by his fellow Demon Kings. But he reincarnated into the body of Ye Xuan, the prodigal son of the Ye family and vowed to himself that he would return to his peak and take back everything that belonged to him!

- Description from Novelupdates