The antagonist of that arc WOULD NOT DIE. Maybe the author was trying to be different by creating an OP antagonist that was difficult to kill but that backfired. Many of us readers really just want him to quickly die because the arc and fights were getting seriously draggy.
His sister Jiang Xiao Rou
"The Empress, she's the right person that he met at the right time. This is probably what is called fate."
If they had met later, like if the Emperor had already ascended the throne, then the Empress would, at maximum, become the Emperor's most favored woman but not his only one. She, herself, would not become Heng fei, but one of the many feipin the Emperor would have forgotten. She may not have even gotten the rank of a guipin.
Up to the very end, Zhuang Luoyan was never Feng Jin's only woman and he never loved her the way He Heng was devoted to Qingju. It is also because of this that Zhuang Luoyan never truly loved Feng Jin.
He Heng knew Qingju hadn't given her full heart to him and he also knew why - she didn't have the assurance that he will only love her and protect her, so for self-protection and to survive, she couldn't give her full heart. It was his persistence that won her over, he showed her through his actions that she could trust him. Feng Jin couldn't give Luoyan that same security - she wasn't his only woman and he didn't love her as deeply. This meant that she was in constant danger of losing the emperor's favour no matter how slim the chance was. I was glad that she never fell in love because if she did, she could never see things as clearly which was really needed in this novel because the emperor was not above using her to maintain the power balance. Also, because she never loved, she wasn't hurt - Some of Feng Jin's actions were, although understandable as an emperor, disappointing as a man/ lover because he simply did not love deeply enough. Also, unlike He Heng, until the end, Feng Jin never knew that Luoyan didn't love him. He really thought that she truly loved him and like one concubine said at the end, he was pitiful, really pitiful because he couldn't even see through Luoyan's fake affections.
Tbh, Feng Jin's indifference to his children made him a really trash absent father. He already had a bunch of kids when Luoyan transmigrated over. I don't remember the princesses ever being mentioned and he wasn't concerned about his princes either, I imagine them only seeing him during events or when they caused trouble. If Luoyan's son wasn't a genius and the other princes not as capable, Feng Jin would be like those trashy emperors in other novels only doting on his favourite consort's son. (Although I think Feng Jin is too level-headed to make him crown prince if he wasn't the most capable.)
I felt that although I know what kind person Luoyan was - calm, decisive, rational and willing to take risks, I also never really knew who she was. It's like some sort of invisible veil around her? She is a fighter who is very perceptive and understood the emperor's heart. So the way she acted - from pretending to be honest with him (she was taking a gamble), to crying in despair (nothing was wrong at all), being upset that he didn't trust her (she wasn't upset cuz she didn't even love him) etc, was all to gain the emperor's affections or manipulate situations. I think her occasional monologues scolding the emperor and calling the concubines his little wives cute yet at the same time I felt that just like the emperor who will never know her for who she really is, I wouldn't know what she really is like with her guard down and what she's actually feeling when not acting (although I think we all know her better than the emperor lol).
Unlike TTNH where MC has physical reactions just by carrying a child qing wu... and even though she's the love of his life, he goes on to marry 3 other women.
no matter how much of a scum the previous him was, it did not warrant her the right to BEAT HIM TO DEATH. It's stated in the novel that she beat him till he nearly died, so it's not explicitly stated... but if he didn't die how did the MC take over his body? Given how strong she was, she could have controlled her strength...