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There is no male protagonist in this article, so please be careful if you mind (the ones in the small world are just the partners for the female protagonist to complete the task) Zhou Yan, a high school girl with grade 1 and grade 2 disease, memorized it to the extreme. Just as the winter vacation was about to begin, he was forced to die young due to someone else's fault. Fortunately, after death, the binding system has the possibility of resurrection. This is a time-travel system. As the name suggests, Zhou Yan, as the host, needs to enter several small worlds to complete tasks. This system is still in the internship period and is not as powerful as its colleagues. It cannot give the host a golden finger, and it cannot give the host a large amount of wealth after completing the task and returning to the original world. However, it can go back in time, although it is only one minute, which is very useless. But for Zhou Yan, this was enough. And what is the most important thing for a girl with middle school syndrome? Of course it's pretentious! The system promised that she could continue to use the skills she learned in the small world after returning to the original world. Therefore, Zhou Yan started her fast-traveling life with the hope of becoming the heroine of Ma Jiawen in the future. -- The four small worlds in this article are presented in order, and each small world is longer: 1. Alternate history, suspenseful investigation 2. Campus series, strange stories about rules 3. Doomsday infrastructure, showing off strength 4. Cultivation of the world and exploring the truth