Give you 99 days 131

The female protagonist, who was collecting herbs in the mountains, accidentally saved the male protagonist. Later, in order to obtain the method of cultivating herbs from the Fu family, she went down the mountain to fulfill her 99 day engagement with the Fu family. However, the male protagonist was forced by his grandfather, and both of them were unwilling. 99 days later, the male and female leads divorced, and they agreed that the female lead would help her mother seek revenge and be back together after the divorce