Startling by Each Step: What If Zhang Xiao Transmigrated to the Qing Dynasty?

Everyone is reborn with their memories intact in the summer of the 43rd year of Kangxi's reign. They watch the real Maertai Ruoxi follow the rules and observe proper etiquette, and understand that she won't protect them when they're down, treat them as playmates, or see them as older brothers. She'll only regard them as princes and imperial sons. She is dutiful and has done nothing wrong, but she is still not the person they've been searching for. Must they spend the rest of their lives in regret? Does that line from the show, “In this life and every life to come, in heaven, on earth, or in hell, may we never meet again,” mean there truly is no chance to atone?