Fourth Brother is Chen Qian, who studied the art of war and tactics, and surprisingly he has applied them to business.
Fifth Brother, the youngest, is none other than Little Sister Lu Huanong, who is proficient in divination and painting. However, she has suffered divine retribution for revealing too much of heaven's secrets, and her days are hence numbered.
Among the five, only Chen Qian and Lu Huanong have a good relationship. Knowing that Ling Zhenfei's medical arts are exceptional, Chen Qian sought ways for Ling Zhenfei to help treat Lu Huanong's illness.
As for their other fellow disciples, Ling Zhenfei had never heard Chen Qian mention them. Had it not been for their conversation today, Ling Zhenfei wouldn't even have dreamt of hearing the name Lu Yunshang from Chen Qian's lips.