(Time travel + space + system + no fixed male lead + popular heroine + childbirth system. The female lead travels through various dynasties and into different characters, not necessarily all of them concubines in the imperial harem. The author is sensitive, so please click the X if you don't like it. Don't criticize the author, because the author can't bear to criticize back, and most importantly, the author really can't win an argument!)

A car accident transported Mu Sili to ancient times, where she was bound to a childbirth system. In order to earn a reward of 100 million, she traveled through various worlds, securing her position as a favored concubine by giving birth to one child after another, and eventually even becoming the Empress Dowager.

The First World: Consort Rong of the Kangxi Emperor

The Second World: Ulanara Clan of the Yongzheng Emperor

The third dimension: Consort Tong of the Kangxi Emperor

The fourth dimension: Consort Li, a concubine of Emperor Yongzheng.

......