Calm in the Mortal World, but Everyone's Favorite

Writing to fit the rankings Ji Mumu, the only daughter of the Zhenbei General, is living under someone else's roof. She was born with the looks and temperament of a proper young lady. Everyone praises her as graceful and well-mannered, with friends everywhere. Until her martial-arts-proficient best friend seems to kill a villain in an alley. She calmly says, "I'll help bury the body." Someone upstairs is so shocked that they drop a blue-and-white porcelain teacup. It shatters on the ground. She looks up and sees that the jade-faced scholar seems familiar. Her best friend: "Isn't that your sickly fiance, the heir?" Ji Mumu remains expressionless. "Then I'll break off the engagement arranged by that cheap auntie." Who could have known that as soon as she returned, the groom's family would immediately come to present betrothal gifts and start picking a wedding date? Ji Mumu says slowly, "Is the heir so sick he's rushing me into marriage to bring him good luck?" Qi Ye, delighted after personally hunting a wild goose, thinks: It's her, it really is her. After all these years of training, this heir can finally repay her kindness. After Ji "Marrying for Good Luck" Mumu becomes the heir's wife, she discovers on her wedding night... Who told her the heir was on his deathbed? Who was shouting in her ear that the Duke's mansion was barely holding on? Who kept sighing that the Duchess was a wicked mother-in-law and the Duke was weak and useless? Ji Mumu, guardian of the empire, tells her subordinates to stay calm. The truth isn't quite what she'd heard. And then... her subordinates start leading the charge in shipping them. Ji Mumu: ??? Are the villains so useless that you all have too much free time? Until one day, evil energy descends upon the capital. The Son of Heaven races in amid purple lightning and sees that the person standing at the very front is his usually delicate, gentle-faced wife, who spends her days reading romance novels at home and is doted on by everyone? Qi Ye: ??? The flood dragon, Ji Mumu, who has just been protected by someone, watches her husband, who upholds proper conduct for men and summons lightning with his bare hands, and slowly realizes: What do you do when, after marrying for good luck, you find yourself the one everyone dotes on? A few things to know before you start: 1. A heroine who is rebellious on the inside, a proper young lady on the outside, calm, adored by everyone, and unaware of it X a male lead who is the Son of Heaven's Chosen and has an overactive imagination, but also upholds proper conduct for men 2. A slow-burn, sweet story with mutual devotion. 3. Cute (?) monsters make an appearance. 4. Do I need to say that this is set in a fictional world? Well, there, I've said it. Theme: Do your duty in the role you're given. The bonds of life and fate are all part of the journey, and wishes will come true.