After Escaping from Death, I Became the Eldest Princess' Knife

[Double heroines + strong alliance + righteousness of family and country] The Song family was framed by traitors and involved in the prince's rebellion. They were sentenced to implicate the nine clans and were about to die at the execution ground. Thanks to the mediation of the eldest princess, new evidence was produced and the 186 members of the Song family were spared despite all the arguments. From then on, Song Mingzhu, the legitimate daughter of the Song family, became the eldest princess's sword, and no one could avoid its edge.