FL-Zhao Hua wasn't the one who killed them directly which sublty tells us that she wasn't corrupted and blinded by her revenge but had kept her true-self as she was always been- pure and innocent.

since he loved Xu Qing Qing so much that he married her in the previous life despite knowing that Zhao Hua was always been innocent after her death, Zhao Hua helped him to fulfill this in their second life to marry him again to Xu Qing Qing despite of his protests. After the retribution of Jiang Yi, Zhao Hua still gave him a way out of his misery through fate-another point of hinting us that Zhao Hua has this kind of attitude "you get what you give" despite all of her sufferings because of them was still compassionate enough to give what they deserve.

At the end they threw in a "secret" from XQQ claiming that all three of them men were jealous of the princess in one way or another. That jealousy is what made it easy for her to steal favorability from her and caused everyone to turn against the princess. However, in the original life, JL said SZH had been the apple of all of their eyes until XQQ came. And the crown prince had doted on her, worrying more she did whenever she was hurt in the slightest. That doesn't seem like jealousy that caused them to dislike her - who isn't occasionally jealous of their siblings?

And at another point, it mentioned that the system gave XQQ an aura that made her irresistible. Although I appreciate that SZH calmly got revenge, I don't really think they deserved their fates. In reality, they were artificially influenced by a supernatural system and not fully in control of their actions. XQQ was given cheats of knowledge in order to perfectly manipulate people, as well as magical antidotes and poisons that no one would have been able to figure out. In the first life her family was monstrous at the end, and I would've felt that they deserved to learn about XQQ and die at that point. But I am much more ambivalent when they restart the timeline and punishment for the original life is the goal. The princess seems to think that problems already existed that XQQ simply brought to light (i.e. Greedy parents, incompetent rulers, faithless lover), whereas the details actually reveal that XQQ created problems that didn't exist prior to her. On the one hand I do feel some satisfaction at a good revenge, but on the other hand, it feels like it was carried out on the wrong life's people.

Strangely, I think the author made the original life's family feel more regret than in the second life. After her death the 3 men seemed upset but trying to hide it, and then each time she was framed, they seemed more upset. In the second, even when confronted with the problem immediately they still blame her somehow.