For her to admit to it was such an audacity Si Ning respected, it was just like his enemies showing who they were and that would not have to stress in out on trying to find them out the moment he joins the harem. From what he had seen the Queen Dowager doesn't like him and Ran Chunhua was against him too and he could see the unknown list of enemies standing in front of him and he wished they would also be bold and tell him to his face so he doesn't have to sit and start racking his brain on who would want to harm him.
The conversation was like he was giving two options which were either he refuses to sign and say bye to being the Empress or sign and be the Empress while being an underlying of the Queen Dowager and losing half of his army. No matter how he sees it, the first option was the better one but if he does that it would mean all his goals would be far from reach because his sole goal he had been trying to acquire and now he was close to it and wasn't going to lose it.
