I Got a Pocket Dimension

(The protagonist isn't a bleeding heart, acts decisively, and follows logic. This isn't a mindless power fantasy.) An accident sends Chen Yi into a fragmented space. He discovers that the soil and a small spring inside have strange effects. At first, he thinks he can use the space's unique properties to grow crops and improve his life, but he gradually discovers that... this world seems to have another side.

(This is a slow-burn story...)