What do you mean when Ding was buried and Yuan Shao was in danger?

Ding Yuan opposed the abolition of Emperor Dong Zhuo. Dong Zhuo bought Ding Yuan's adopted son Lu Bu with a red hare, and Lu Bu killed Ding Yuan! Yuan Shao and Cao Cao fought, and the primary reason for the failure was that Xu You, who was corrupt and took bribes, was scolded, so Xu You went to Cao Cao to present a plan to burn Yuan Shao's grain and grass and defeat Yuan Shao! These two sentences are mainly about villains. Ding Yuan is brave, but Lu Bu is heartless! Yuan Shao is righteous, but Xu You is too greedy.