Of the harem members, Tang Ziyan knows the least about the MC and looks down on him the most. I guess it's natural with her having interacted with him the least outside of the regulated school setting. It's not good in the long run, though. The whole situation is quite ambiguous, however. Tang Ziyan was his lover from the non-reverse world past life, so he has deep feelings for her, despite the girl being totally different, aside from the looks, in this world. So, she didn't have to do squat to gain his interest. Ye Chenxi is the total opposite, trying to do her everything to capture him, while she in fact owes to him for saving the Ye matriarch. Huahua... I feel like she's in the most precarious position because it very much feels like she's just a convenient woman for him and he a convenient man for her. The bond between them isn't much.