Traveling Through Wu Dalang, Who Killed My Brother Wu Song?

Ten years later, Wu Dalang only met his younger brother Wu Song twice and spoke a few words. On the first day of time travel, Wu Dalang was wearing a lucky suit and held the cup of medicinal wine in Pan Jinlian's hand. In the second year, he waited until Wu Song had defeated the white tiger on Jingyanggang. The other party secretly gave him a piece of silk and whispered, "Don't recognize me. There is something left for you under the largest redbud tree on Jingyanggang." Three years later, Liangshan attacked Zengtou City, and Wu Dalang led the Dongping Prefecture Daozhengsi to watch the battle. In the chaos of the army, Wu Song was already flying with a blue dragon on his left arm and a white tiger on his right arm. "Stay away from me, Daozhengsi has a problem too." In another five years, the generals in Liangshan will be ranked, and the sky will hurt the star Pang Ling. Wu Dalang's eyes were bleeding and he took out the thunder whip. "Who killed my brother Wu Song?" (Not strictly following the plot of Water Margin)