Sun Xiaofeng walks on the snow on the playground before classes at Yantai primary school in Yantai Village of Lianhua Township in Tieling City, Northeast China's Liaoning Province, Jan. 8, 2019.

Hu Zhisheng helps his student Sun Xiaofeng to tie the red scarf on Jan. 8, 2019. Located in a remoted mountain village, most students of Yantai school had transferred to other places outside the mountain. Sun Xiaofeng, a third grade student, became the only student of the school in September last year taught by Hu Zhisheng, the only one faculty of Yantai primary school.

Hu Zhisheng cleans the classroom before classes at Yantai primary school in Yantai Village of Lianhua Township in Tieling City, northeast China's Liaoning Province, Jan. 8, 2019.

Hu Zhisheng makes a fire at Yantai primary school in Yantai Village of Lianhua Township in Tieling City, northeast China's Liaoning Province, Jan. 8, 2019.

Hu Zhisheng tutors his student Sun Xiaofeng at Yantai primary school in Yantai Village of Lianhua Township in Tieling City, northeast China's Liaoning Province, Jan. 8, 2019.

Sun Xiaofeng answers exercises at Yantai primary school in Yantai Village of Lianhua Township in Tieling City, northeast China's Liaoning Province, Jan. 8, 2019.

Hu Zhisheng and his student Sun Xiaofeng walk to school in Yantai Village of Lianhua Township in Tieling City, northeast China's Liaoning Province, Jan. 8, 2019.

Hu Zhisheng and his student Sun Xiaofeng walk to school in Yantai Village of Lianhua Township in Tieling City, northeast China's Liaoning Province, Jan. 8, 2019.

Hu Zhisheng and his student Sun Xiaofeng walk on the road after school.

Hu Zhisheng and his student Sun Xiaofeng walk to school in Yantai Village of Lianhua Township in Tieling City, northeast China's Liaoning Province, Jan. 8, 2019. (Photos: Xinhua/Yao Jianfeng)