Prince Qui was not used to apologizing. Being raised as a royal, one of the things that you should never do was apologize. Where would your integrity go if you were going to be corrected at all times? What they say was the truth even though it was wrong.
Luckily for Prince Qui, he was not only raised by royals, he was also raised by a general. One of the best qualities in being a general was being honest. You cannot lie to yourself. If you do that, you are not only endangering your life, but your troops' as well. Reality was a hard slap on the face but the military taught him to deal, tackle, and live with it. So that what was he was going to do. He was going to apologize to the Tianshi Xue.
She must be feeling confused, scared, and hurt after learning that her father was the one who killed her. For money.
She must be feeling so alone.