I don't follow the plot of the story of traveling into the era

Shen Shuyu should be the most frustrated time traveler. She just won the lottery and didn't have time to claim it. She was so excited that she opened her eyes and found that she was in a book. Unsurprisingly, the body she wore was of course a vicious female supporting role. The heroine Shen Xue in the book is her cousin. She is beautiful, kind, hardworking and a good girl praised by everyone in the village. She is arrogant and domineering, and she is too lazy to turn over when sleeping. She is a negative example for her villagers to educate their own girls. Shen Shuyu recalled the plot in the book. The plot began because the female supporting role picked up a wild man in the mountains. This wild man was none other than the male protagonist. He took good care of the male protagonist and fell in love with him over time...