Rebirth in Wilderness

Li Mei has been reborn. She was a senior high school student and used to be bullied at school and at her part-time work. The day she rebelled is the day she was murdered.
After being reborn, she is a farmer's daughter in Qinxi, ancient China and her family is bullied by the whole village. She has 3 siblings: 2 elder brothers and 1 younger brother. After much bullying, the whole family is chased from the village and takes refuge in the mountains. There, they manage to discover a cave that opens the door to an immortal world. They learn martial arts and gain strength and knowledge. But they can only stay for 20 years and move back to their old village. 20 years in the immortal world are 2 days in the village world.