DX did not tell Ghost the entire story.
On the day after Kai An was rejected by General Nakamura, he had called DX for advice. Even though DX scolded him and told him to man up, he felt that he had to help his only brother-in-law so that the latter would not bother Kai Xin with his problems.
Last night, after he went through the forums with Kai Xin, he waited for her to go to sleep before giving Naomi Nakamura a call. If Luo Yin wanted to play, he would play along with him. He was not the only who could play behind the scene.
Even though she was about to sleep, she immediately got out of the bed when she saw who called.
When he told her that he had a way to get her father to agree to break off the engagement, she was reluctant to follow his plan as she did not want to stoop this low. However, she eventually agreed when he told her that his father and Luo Yin's mother was looking at the dates and they would pin a date before the next quarter.