The universe is endless, with thousands of small worlds. Some worlds have the destined daughter as the pillar, and some have the chosen son as the pillar of the world. There are endless types of systems, time travel, rebirth, and book travel. Xu Ziyan, a second-year university student, met a "thing" who looked like a system but claimed to be a tour guide one day and started a journey across the world. (Actually only seven or eight)
Concept: Various operations in various worlds