Transported to a Year of Famine, I Become Everyone's Favorite with the System

Song Yao transmigrates into the body of a tiny child in ancient times. With her little legs, the child follows a huge band of refugees across barren mountains in search of something to eat. It is a year of famine, when humanity is at its darkest. She has been separated from her only mother, and has only three “brothers,” unrelated to her by blood or adoption, to depend on. The eldest is gentle and considerate, the second is straightforward and forthright, and the third is so beautiful he looks as if he stepped out of a painting. Most importantly, the Big Shot Nurturing System she carries tells her that all three are promising candidates, and raising them into big shots will earn her rewards. Hold the eldest brother's hand: reward, potato seeds. Flatter the second brother: reward, a sweet potato. Help the third brother solve a problem: reward, a chicken. Wait... why are all three brothers suddenly asking her to make things official! Song Yao: Uh-oh, I took things too far!