Who is my brother who believes in Zheng Qunjiao?

I believe Zheng Qun's brother is Zheng Bin. According to relevant public information, Zheng Bin is Zheng Qun's brother in the TV series Faith. Faith is a military intelligence drama directed by Hua Qing, starring Michael and Adi, and joined by many powerful actors such as Guo Tao, Zhong, Gan Ting Ting, Zhang Jingjing.