I'm not sure specifically as there could be many novels with such a title. It might be about a character who causes chaos or upheaval in the world they live in, perhaps through some extraordinary power or a series of misadventures.
Well, without having read it, it could potentially revolve around a protagonist who has an inadvertent or deliberate impact on the world's order. Maybe they disrupt political systems, social norms, or the balance of nature in the story. It could be a story of how one individual's actions can have far - reaching and unexpected consequences on a global scale.
Since I don't know the exact 'I mess up the world novel', it's hard to say precisely. But generally, in a novel with such a title, the story might start with the main character in a normal situation. Then, due to some internal or external factors like a scientific experiment gone wrong, a magical spell misfired, or a personal vendetta, they begin to make changes that mess up the world. This could lead to all kinds of events, from conflicts between different groups trying to fix or take advantage of the situation, to the character's own journey of realizing the magnitude of what they've done and trying to make amends or continue their path of disruption.
A practical answer is Chapter 11, because it turns the idea into a concrete scene. The chapter opens with After a meeting, Shang Shaojing pinched the bridge of his nose, tired, and..., adds pressure through Qin, could you pour me a cup of tea as well?, and ends on Miss Qin, please accompany us to.
The best chapter pointer here is Chapter 17, "Madam, the eldest young master has disappeared again". It opens with Jiang Li glanced at Jiang Shixu, who was tense and anxious behind her, and... and closes on I've been a mother for more than ten years but never tasted anything made....
Chapter 894, "I Want to Attend the Same University as My Sister", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The sound of early summer cicadas was close to the ear.
Chapter 815, "You've eaten through all the savings!", is the clearest early answer because it turns Jiang Buchen's situation into a concrete plot event.
Chapter 790, "Formation Night", is the clearest early answer because it turns Xi Yang's situation into a concrete plot event. A useful checkpoint is the way the scene starts with In a Daoist temple on the outskirts of the city.
Chapter 861, "Add the Link!", is the clearest early answer because it turns Taoist Changqing's situation into a concrete plot event. The chapter turns that into something concrete by moving from At exactly ten in the morning, Jiang Li started her live stream.
Chapter 677, "Worshiping Sister While Avoiding Them", is the clearest early answer because it turns Jiang Shixu's situation into a concrete plot event. Early on, You should learn from your sister; she's made her own fortune and is....
Chapter 878, "Do You Dare?", is the clearest early answer because it turns Seeing Su Yinwan's situation into a concrete plot event. It opens with Su Yinwan not only chose a remote location for the meeting, but the... and closes on She hated this demeanor of hers the most!.
Chapter 738, "Here to Fight!", is the clearest early answer because the buildup finally cashes out in a real clash. A useful checkpoint is the way the scene starts with Feeling that something was amiss, he immediately called Jiang Li.
Chapter 653, "Everyone's Champion", is the clearest early answer because it turns Miss Jiang's situation into a concrete plot event. The chapter turns that into something concrete by moving from As dawn broke, "Wilderness Survival 30 Days" released a notice on...