I love your recap. I read the translated Pillow Book at least 50 times. Just want to make a quick correction since you said to correct you if it's different than what you stated. In the mortal world in the pillow book, Feng Jiu was Dong Hua's concubine. Like the drama, she followed him to repay the debt. However, unlike the drama, she was no longer pursuing him. She really was creating a love trial for him. He was in love with her but she refused him. She tried everything to get him to leave her but he won't. She finally wrote a love letter to another of his woman before he gave up and award her to his general as a concubine. Love trial completed. Later, Feng Jiu ended up saving Dong Hua in the mortal world and the general saved her. She repaid her debt but now owes one to the general.
They are filming the Pillow Book drama right now and the two leads will be the same. I don't know how they can bring the story back so it can be true to the book. I love the book romance so much more than the drama. However, I will take anything as long as it's them two.