My Sister-in-law is Actually My Wife

This is the story of someone who believes she's taking care of wives and daughters for her twin brother, but in reality, she's been caring for her own wife and child all along. There are personal touches in the story regarding traditional Chinese medicine and cinnabar, so please don't start criticizing immediately!Su Yanxi, the young prince, takes her twin brother's place to Weicang Kingdom, primarily on a mission for marriage diplomacy. However, instead of finding a wife, she finds a girl who seems to be... her daughter?The little girl looks undernourished, small and frail, but she clings to Su Yanxi's pant leg, looking up with watery eyes, and calls out, "Daddy..."Su Yanxi: "..."Even though she doesn't want to admit it, this child looks exactly like her. Perhaps because she's a girl, she resembles Su Yanxi even more than her twin brother.Five years ago, Nan Jiyan was taken advantage of by a stranger. When she first saw his full appearance, the child's father forcefully married her. As she gradually developed feelings for him and finally lost her heart, he told her, "I am a woman; that day, it wasn't me."He smiled warmly and gently, but Nan Jiyan felt as if she'd fallen into an ice cellar.A woman? She is a woman? And the child's father... isn't him either?Nan Jiyan's hand paused in the action of undressing, and tears began to fall unwillingly. Su Yanxi, however, raised her eyebrows and gently kissed away the tears from the corner of her eyes. In that moment, the half-opened clothes slipped from her grasp.She whispered softly, "But it was me who came to marry you, me who stood beside you at the altar, and it was me... who spent the night with you."Later, she realized that it was indeed her that day, and the little one was also hers.Intermittently insane top vs. gentle yet resilient bottomContent Tags: Childbirth, Court Nobility, Deeply Devoted Love, Time Travel, Serious DramaSearch Keywords: Protagonists: Su Yanxi, Nan Jiyan ┃ Supporting roles: Nan Yangu ┃ Others:One-sentence Summary: The child resembles me, so she must be mine!Theme: Join hands to create a better futureAlternative Title: The Child of the Abused Female Protagonist is Mine?!TL Note: from chapter 15 the price of advance chapter are increase due to how long the chinese character is - average about 5.5k to 7k characters equal about 6-8k words