Who is Kang Daguang, the hero behind enemy lines?

With Liu Fangfang. According to the TV series Heroes Behind Enemy Lines, Kang Daguang and Liu Fangfang are together. Heroes Behind the Enemy tells the story that the Eighth Route Army129th Division cooperated closely with local armed forces in Jizhong Plain, smashing the raids of Japanese puppet troops many times and successfully defending the base areas.