Comprehensive Martial Arts: Taking concubines to become stronger, summoning shadow assassins

Yang Hao traveled through the world of comprehensive martial arts, and became the puppet emperor in Yu Wenhua's hands at the beginning, facing the danger of being killed and replaced at any time.
What's even more terrible is that at the beginning of the game, she is going to marry the saintess of the Demon Sect, Houhou, as the imperial concubine, and she will be played by Houhou to death at any time.
Fortunately, the concubine becoming stronger system was launched in time. As long as Yang Hao...