Walk-In Cave: I Am Engaged in Infrastructure Construction in Troubled Times.

Ling Yue, a modern female doctor, accidentally traveled to an imaginary ancient world with frequent wars and poor people's livelihood. When she was in a desperate situation, she accidentally opened her personal space and discovered that there was a spiritual spring and a time and space door connecting the modern world. In order to survive, she uses the space spiritual spring to improve herself, cultivate high-yielding crops, and quietly obtain modern knowledge and small batches of materials (in the early stage, they may be medicines, seeds, and tools) through the time and space door. In a turbulent environment, she met Xiao Tianche, a cold-faced general who had been demoted and exiled. Initially wary of each other, they had to work together to deal with common threats (insurgency, banditry, famine). Ling Yue has become an indispensable "all-round logistics" for the team by relying on space materials and modern knowledge, especially the gradually developed thermal weapons (such as improved gunpowder, land mines, flintlock guns and even more advanced weapons in the later period) and farming infrastructure capabilities that transcend the times. Xiao Tianche used his military talents to train guards and resist foreign enemies. The two gradually fell in love while fighting side by side, and Shuang Jie's relationship is extremely precious in troubled times. Starting from a small stronghold, they took in refugees, reclaimed wasteland, built water conservancy projects, and developed industry (primary level), gradually creating a paradise and a strong base in troubled times. As their power grows, the challenges they face also escalate: suppression by local powerful people, suspicion by the court, invasion by enemy countries, and the looming appearance of unknown supernatural forces... Ling Yue's space-time gate ability has gradually increased, and can transport more and more critical materials, and may even shuttle people to a limited extent, but the risks and costs of using it also come with it.