Why did Ce Tian Jr.' s mother fake her death?

The little mother faked her death because the emperor couldn't bear to let her son die and let the little mother trade her life for her sister's. By the end of June 5438 +20221October 5, according to relevant public information, Xiao is a virtual hero of the online novel Tiantan, the founder of the overseas battlefield organization of Tiantan, and has four kings of war, darkness, slaughter and annihilation and 3,000 gods of war. Ce Tian Jr. spent his whole life on the battlefield, guarding the safety of the building and protecting his wife Gao Weiwei and daughter.