My Physician Duchess

In the capital, everyone knew about the two beautiful daughters of the Lu family. The elder sister, renowned for her beauty, was engaged to Duke Chu, and the younger sister, equally stunning, was promised to a noble's heir. However, when Duke Chu fell gravely ill, the elder sister hooked up with the Crown Prince, becoming his consort. This humiliated Duke Chu and left her younger sister in a difficult situation. Modern doctor Lu Yunyao travels through time and unfortunately becomes the unlucky second daughter of the Lu family. To make matters worse, her ex-brother-in-law, the sickly and twisted prince, takes her back to Duke Chu's residence. One is a patient, the other a doctor, and they hit it off immediately—he helps her clear her name; she helps him treat his illness. Clothing: No bright colors. I like plain ones. Food: Regardless of the chefs' skills, I want your cooking, even if it's just scrambled eggs or shredded potatoes. Living: The former princess's quarters are now called the "Hiding Beauty Pavilion." It's for convalescence, don't ask why. Movement: You can move freely within the mansion. Leave, and you'll be punished severely. Everyone believes the second Miss Lu of the Lu family is miserable, but Lu Yunyao's happiness is beyond anyone's imagination. Adorned in luxury with plenty of servants and supported by the frail Duke Chu in her endeavors. Ruining her reputation? Not a chance! Even with the Duke's weak constitution, her active cooperation might not ensure success. Minister Qiu's famous words: Only others can interfere in our duke's marriage? Our duke will show them otherwise! Hmph!

Synopsis from DramaGo.