Male supporting character. A comrade at Sanlian Brigade who stopped Qi Fangming before he left and asked about Su Jian's niece named Su Yin. He kept asking how she was doing and whether she would come back in the future. Qi Fangming sensed that this comrade probably likes Su Yin and described him as lovesick. Gu Cheng'an listened silently and hung up quickly when Qi Fangming suggested he pass along a message.
