What kind of person was Shi Siming, the No.2 figure of An Lushan Group in the Anshi Rebellion?

Shi Siming is a bad-tempered, sinister man. When An Lushan launched the Anshi Rebellion, he also privately advised An Lushan. In order to seize power, he rebelled and became emperor, but his personality became very irritable, perhaps because one good turn deserves another, and one evil turn deserves another, and he was finally killed by his son.