Reborn with a Childbearing System, I Enter the Palace and Become Empress

In my previous life, my scumbag cousin and scheming cousin-sister burned me alive. Reborn at fifteen, I tore up my marriage contract and, armed with a childbearing System, married the emperor, whom the imperial physicians had declared unlikely to have children. The entire harem waited to laugh as I lost favor for bearing no heirs, but I had one child after another: Noble Lady, Jieyu, Zhaoyi, Noble Consort, Empress! When I was pregnant with my fifth, the emperor held me and pleaded, "Wanwan, let's not have any more. I'll let you play with the empire."