1. According to Sina News, as of June 9, 2023, Li Nan, a math teacher at Fushun Primary School in Harbin, was 50 years old and a first-grade math teacher. He has decades of teaching experience and rich professional knowledge.

2. Li Nan, who is interested in mathematics, compiled the course "Brainstorm", which is of great help to students' thinking and has a high level of mathematics.