BEWARE of SPOILER
First Life
Ruan Ning, a transmigator, broke off her engagement, and she was replaced by her younger sister, Ruan Xi. Ruan Xi and her husband, Qi Yue An, had a blessed life with three sons and a daughter. Ruan Ning end up as the Emperor's Concubine and was buried alongside him when he passed away.
Second Life
The reborn-transmigator Ruan Ning decided to stick with her fiance, Qi Yue An. Ruan Xi, also a transmigator, got engaged to Wen Ting Zhou who was rumored to be a cut-sleeve in the First Life. After some twists and turns, mostly started by Ruan Ning, her engagement got broken. Qi Yue An married the young lady from Yang's family who turned out the be the reborn Ruan Xi. Ruan Ning again ends up as the Emperor's Concubine but, instead of being buried with him, she was conferred as a Dowager after his death. While Ruan Xi, lived a blissful life with her husband and three sons, and a daughter.
The title of the novel was the biggest spoiler for this novel. As such, all the villains were mediocre and silly at best. It was truly laid-back and can be read in one sitting.