Why did I and my motherland Zhang Yi run back?

To shut down the uranium enrichment reactor.

Gao Yuan, the character played by Zhang Yi in Our Country, spent three years in the R&D base in order to complete the research and development of the atomic bomb, during which he never met his parents and girlfriend. Finally, in order for the team members to evacuate smoothly, he returned to the laboratory alone and turned off the concentration axis reaction device.

My People, My Motherland is a feature film directed by Chen Kaige, co-directed by Zhang, Guan Hu, Xue, So Chol ng, Ning Hao and Muyewen, and starring Bo Huang, Zhang Yi, Jason Wu, Ge You, Liu Haoran, Song Jia, etc.