I'm Deeply Doted on by the Marquis

I'm Deeply Doted on by the Marquis Plot:

Su Wanwan, an unfavored concubine's daughter of the Prime Minister's family, is forced to marry into the Northern Town Marquis's Mansion to take the blame for her legitimate sister. The legendary cold-blooded Marquis Gu Zhao, who is said to kill without blinking, unexpectedly holds her in his arms on their wedding night and whispers softly: 'Wanwan is afraid of the dark, I'll stay with you.' Since then, the mansion has a young mistress who is doted on like a princess—her daily necessities are more exquisite than the queen's, the Marquis personally leads the horse for her when going out, and even when the Empress Dowager summons her, Gu Zhao dares to refuse the order: 'My wife is afraid of strangers.' As Su Wanwan falls deeper, she accidentally finds an old handkerchief in Gu Zhao's secret compartment—it's the token of the little beggar she saved when she was a child. It turns out that the little boy who was given half a steamed bun by her ten years ago has long engraved her into his bones. When the concubine frames her for 'killing her husband' and the Prime Minister's family wants to take her back for a political marriage, Gu Zhao stands in front of her with a long sword: 'Whoever dares to touch my Wanwan must step over my dead body.' And Su Wanwan finally dares to hug his waist: 'This time, let me protect you.'