Marrying My Sister's Fiancé [Period]

Tang Lu's older sister disappeared while fleeing famine. To honor the marriage agreement with Wang Chu, Tang Lu had no choice but to pretend to be her sister and marry him. She thought Wang Chu would call off the wedding, but to her surprise, he cooked the dishes she liked, bought her pretty clothes, and treated her with care. Just as everyone in the compound thought Tang Lu and Wang Chu would live happily ever after, Tang Lu's sister, Tang Li, came back.

Theme: Perseverance.