سيما يي
Huan Fan, one of Cao Shuang's advisers, managed to escape from Luoyang with the official seal of General-in-Chief and bring it to Cao Shuang. As his family members were being held hostage in Luoyang, Cao Shuang entered a dilemma on whether he should surrender to Sima Yi or not. However, after Sima Yi promised him that he and his family would not be harmed, Cao Shuang surrendered and relinquished his power to Sima Yi. On 9 February 249, Cao Shuang's fate was sealed. After gaining power, Sima Yi broke his promise, had Cao Shuang and his family arrested and put to death on charges of treason.