Luo realized that whenever she's involved with Yu Sheng, things never go well for her. However, considering she had already signed a soul-selling contract with this new boss (which is how she viewed the Blood Transferring Ceremony), any regrets or lamentations were too late. For now, she could only accept her fate.
It's only fair to say that switching sides can be like this; a legal license is a path of no return. Once you take it, you can only follow it to the end of darkness... into the depths of brightness, where an even more brilliant future awaits, much more thrilling than Subspace and Black Spirit Ability.
