Who is Chen Xiao's husband who is fighting alone?

Actor: Zhang Tong (guest)

Dang Weiguo was injured in the battle and lurked in Shanghai for illness. He thought he had lost his wife, Chen Xiao, and met him by chance. When he learned that Chen Xiao was pregnant, he had another "husband" who could play the piano, and countless "whys" haunted him. Chen Xiao's special status has brought a lot of "troubles" for the Party to defend the country.